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Repair focus How do I replace or repair set screw on fine focus knob?

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Focus knob screw

I've had the same problem. Unfortunately, these are knock-off scopes. If the shaft that the focusing knobs attach to is still there, you can replace the knobs themselves by ordering THIS part. If the shaft AND the knobs are both missing, you'll have to replace the entire focusing mechanism (sorry, but I don't know where to order the housing from). Hope it's more helpful than the prior answer.

Posted on Jun 24, 2008

SOURCE: need replacement parts for astrolon reflector 525X

They do not sell parts for these low cost telescopes. However you might find what you need inn the bolt and nut section of a well stocked hardware store.

This brand is sold by Toys R Us--

Posted on Apr 18, 2010

Testimonial: "Thanks. We'll go check Ace or Godwin Hardware to find bolts that will compare. I read yr other advice posts;will take yr advice for a future telescope"

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1 Answer

Hi, Original focus knob fell off my atx 70 and now the 'focus rod' goes inside the telescope instead of moving front part. Is there any way to fix it?


The knob had a tiny set screw on the side of it-- that tightened down on the shaft.

See if you can tighten it back up. If it is missing take it to a well stocked hard ware store and see if you can find a replacement Allen style set-screw.

Apr 06, 2011 | Meade ETX-70 (240 x 70mm) Telescope

4 Answers

8x25 minolta compact bionoculars center focus knob will not turn. Have taken screw off center knob and removed 4 rubber strips on bionocular body and looks like allen? screw underneath. No obvious way...


They don't make these things easy to take apart, or fix. Here's your best shot- take it into a camera repair shop, and see what they say. Some tech might know what you have to do to get it apart, or if it can come apart without damage or special tools.
Unfortunately, only the repair techs know how, and there aren't too many (if any) of them, since they often just charge a set amount and send a refurbished or new pair to the customer.
Wish I had a more specific answer, but good luck to you, and with just a bit, you'll figure this out.

Sep 20, 2010 | Minolta Compact Binocular

1 Answer

My focus knob does not work correctly, is this easy to fix?


There is a tiny set screw on the side of the knob. Make sure this is tight, and the knob is not just spinning around and around.

There is also a small rod inside -- that the focuser attaches to. If tightening the setscrew does not fix it, you will need to remove the focuser and see if it is detached from the rod. Make sure the scope is tilted BACK with the front of the scope UP a little or the mirror will slide to the front and possibly break.

This web site has lots of repair pictures--
http://www.weasner.com/etx/menu.html

Aug 09, 2010 | Meade ETX-125EC (500 x 127mm) Telescope

1 Answer

Need replacement parts for astrolon reflector 525X telescope. 1 Yoke Lockig Knob (missing) 1 screw on the yoke which is to hold the "Fine adjustable altitude control" lever. and might need to replace the...


They do not sell parts for these low cost telescopes. However you might find what you need inn the bolt and nut section of a well stocked hardware store.

This brand is sold by Toys R Us--

Apr 18, 2010 | Edu-Science (10166) Telescope

1 Answer

There is some sand or dirt under the focus knob that makes a noise when the knob is turned. How do you take the knob off to clean . Thanks


There is a central aluminium decal on the focus knob. CAREFULLY prise it off using the tip of a sharp knife trying not to distort it (it's hard to panel beat a small bit aluminium!). Once off you should see a central screw or two screws that hold the focus wheel in place. Remove the screw(s) and the focus wheel noting the orientation of the focus wheel to the body. Use a dot of Liquid Paper to show registration. You can then clean around the focuser and the inside of the focus wheel before reassembly.

Jan 03, 2010 | Swift 10x42 HCF Viceroy Waterproof...

1 Answer

Focus knob problem


have repaired a few of these ...some whells have tiny set screws to tighten, some are a two piece wheel that loosens up sometimes, if not that then it is broken. if i can be of further help...15088331232

Apr 26, 2009 | Optics

4 Answers

Can't focus my telescope


If there is nothing on the objective lenses or eyepiece lenses then it most likely needs collimation. This is where you adjust the secondary mirror while viewing an out of focus star. You need stable sky conditions to do this.

There are most likely three small screws at the front of the telescope and these are what you use to adjust it. As one screw is loosened then another is tightened. Do this in very small increments. If you have your manual it should outline how to perform this. If not go to this web site: http://www.astrosurf.com/legault/collim.html. It will show examples of how objects look both in and out of collimation. There is a section further down the page for SCTs.

A very handy tool for this is to replace your screws with Bob's Knobs (http://www.bobsknobs.com/) . These replace the screws and allow you to adjust it by hand instead of a screwdriver.

The other focusing problem I've experience with my Celestron SCT is to have the focus knob loosen up and then slip as I turned it so that I could never focus with it.

Good luck and clear skies!

-jodair

Mar 29, 2009 | Meade Optics

1 Answer

Russian Lomo (Biolam?) old monocular-coarse focus wheel slippage


The right hand shaft knob contains the coarse focus locking clutch adjustment mechanisim( big name-simple design). This solution applies if you have the model with the fine adjustment wheel mounted in the base and may or may not apply if your fine focus is in the left-hand knob.

Inside the right hand knob ( as viewed from the rear of the scope) is a threaded disk/nut which has two pins (Slightly and for reasons I don't understand: they are offset vertically, they have different pin diameters and different pin lengths) In theory, they lock into the bushing within the knob proper to keep tension on the clutches while keeping the knob from falling off.

The repair can proceed in two ways depending on if the disk/nut has totally been unscrewed from the focus shaft.

Gently pull the left knob and as you do turn it slowly to see if the pins reseat. If they do you'll feel a slight lurch outward of the knob. Hold gentle outward tension( so as the pins remain seated) as you turn the knob clockwise until the slippage in the clutches is so lessened that your knob is firm and the focus adjustment is operating to your liking.

IF that didn't work it is likely that the threaded disk/nut has come off the shaft and will need to be reset and screwed back down. The disk is easily cross threaded and you'll need tweasers or micro plyers or a hemostat and/or a flat headed finishing nail. Plus I recommend a small bottle of LOC-TITE(tm) semi-solid thread sealer--NOT the kind that freezes the threads

As you unscrew the knob counter clockwise pull on the knob to slid it off the shaft it should come off in your hand revealing about 6-8 washers on the shaft. These are the clutches so be careful not to loose them.

The knob should have a slight rattle and that is the disk nut. To get to the disk/nut put a small finishing nail head first into the shaft whole and push to release the plastic knob insert cover out being careful to not loose the disk/nut.

To clean the threads and insure an easier repair screw the disk onto the focus shaft to insure the threads are clean.

This next part works better with the scope lying on its left side.

This part is optional but not necessary to get the scope back in operation. Place a tiny amount of LOC-TITE thread sealer on the shaft threads. This will make the knob clutch adjustment more stiff but will also reduce the likelihood that the knob will be adjusted out too far again. The loosening occurs when the knob is turned before the operator realizes the pinion gear limit has been reached or by someone who dosen't understand correct opperation of the focusing assembly.. So long as the clutches are engaged the and there is no slack in tension the disk/nut shouldn't come off the shaft again.

Observe the pins in the disk/nut and match them up with the holes in the aluminium/brass knob bushing. You'll have to wiggle the disk around to get it reseated properly. Once you do, hold the disk firmly against the bushing to keep the pins seated as you put the knob back over the shaft, pushing it all the way down against the shaft.(The clutches are springy so don't worry about it locking in place just now).

You may prefer to hold the disk/nut and knob firmly with a finger and spin the left hand knob counter-closkwise for easier threading of the nut but remember this will also move the focus arm. Not a problem if you start with the focus in the range centered.

If using the right knob: Turn the knob clockwise feeling for the threaded shaft maiting back up with the threads. IF it cross-threads, back it off try again. Once the threads are engaged keep the outward tension on the knob so the pins don't slip out. When you/ve screwed it down far enough, the clutches will take up the slack and keep the knob from slipping away from the disk/nut. You'll know the clutches are engaged when the focus shaft turns.

If you are happy with the repair slip the knob cover back on and snap in place. It if falls out place a little of the thread sealer on the rim and try again.

If you like this solution it took me an hour to write it up. Please consider volunteering an hour with a local non profit. I support the American Red Cross, Habitat for Humanity and the USO.
Regards



Mar 27, 2009 | Lomo Science & Laboratory

1 Answer

Focusing Issue


The screws should be short enough not to stop the primary's travel, but pull them out and try it again. Good luck! George.

Jun 25, 2008 | Celestron NexStar 11 GPS (660 x 279mm)...

2 Answers

Focus knob screw


Not enough information to answer question.

Jun 04, 2008 | Optics

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