Question about Dremel 300-N/55 300 Series Tool Kit

1 Answer

Dremel shaft lock spinning

I have a Dremel 300 and the shaft lock assembly isn't
working to hold the shaft so I can get the collet nut loose.
When I try to get the collet nut loose while holding the button of
the shaft lock the shaft lock just spins along with the collet nut
so I can't get the nut loose.

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  • 2 more comments 
  • bearjosh Nov 18, 2008

    I have the same problem with my dremel, when i am trying to loosen the the collet nut, the shaft luck will not hold the shaft well enough and I cannot loosen the collet nut either.

  • Anonymous Dec 06, 2008

    Same problem. Only used the tool a few times. Shame

  • Anonymous Jan 01, 2009

    My Dremel 300 has barely been used, is just 2 months old, and the collet nut cannot be loosened. The blue button will not hold the shaft tight enough. Previous Dremel failed similarly. Am extremely disappointed with Dremel. Will avoid their products in the future.



  • Anonymous Mar 09, 2009

    I have the same problem after just one month. I took it apart and I see the problem, it is really cheaply made. The post that slides into the shaft hole is very small, and wears quickly. Did I mention it was cheaply made....

    You can buy a new one and replace the part. My advice...buy several since it appears you go through many if you use your Dremel alot.

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Trying to fix a similar issue. The pin that gets pushed in by the button (and returned by the spring) seems to be fine. The hole in the rotating shaft that the pin fits into, however, is in the wrong place, so the pin never goes into the hole! All I need to do is somehow pull the whole front part of the shaft out about 1/16th of an inch, and it'd be fine. I just can't seem to budge it though. Any tricks, anyone?

Posted on Feb 12, 2011

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: I have a Dremel 300 and the shaft lock assembly

The "nub" on the shaft lock assembly (internal) has worn down and the assembly needs to be replaced.

If you feel competent to open your Dremel yourself (and it's not on warranty) then order the shaft lock assembly from Dremel (early 2011 price: $1.25, not sure how much postage & handling might be). After opening the tool you will find a metal ring and a small piece (the lock) which it holds in place around the shaft where the lock button is located. Remove the old pieces and replace with the new ones and reassemble the tool.

Otherwise you can send the tool to Dremel to be fixed.

Posted on Jan 21, 2011

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1 Answer

I have dremel 4200 ezchange bit broke inside collet how do i take collet out


remove the collet nut
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How do / What do U do to lock on/hold to to a tool,s working shaft ???


If I properly understand your question, it sounds like you probably want to loosen [unscrew] the collet nut in order to remove and exchange tool bits.

If THAT is the issue, then the answer is that it is not necessary to "hold" the shaft with any kind of hand-tool!

Dremel, and most of its imitators, install a "pin" type shaft lock right near the collet nut.

When gently pressed inward, the pin engages with a SINGLE hole in the shaft. This means you must gently hold the pin down against the shaft while very slowly turning the shaft with your fingers only.

When the hole in the shaft comes into alignment with the pin, your finger pressure will cause the pin to fully insert into the shaft hole, effectively "locking" the shaft.

As the pin is spring loaded to keep it away from the shaft, you must continue to hold the pin down until you have finished installing a tool bit, or finished whatever operation you intended. Or, if you release it, just go through the locking process again when needed!

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The coupler nut tends to be screwwed on so tight that even when undone, the collet has bit into the soft shaft of the tool. Holding the rotation lock button in, grab the shank with some strong needle nose pliers and twist the shaft loose or pull it off completely with the nut and then seperate the nut from the shank when it is out of the Dremel Tool. A lot of machine tools are tightened too much, which makes the shanks get all damaged so use only the required tension on that collet nut.

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Dremel 300 Series - I can't get a collet to go in the shaft. looks like something the same size is in the shaft but is not proturding to pull it out. Unable to wedge it out.


There is a collet stuck in there. It was probably in there without any tool in place, then the collet nut was tightened. With no tool filling the hole in the collet, it collapsed and became small enough to be pushed too far in. Fortunately these collets are soft steel. Find a sheet metal screw that you can screw into the hole. That will allow you to pull the collet out. Discard that collet. These collets come in at least two sized to accommodate different sizes of tool shafts. Unfortunately the spare one you have is one of those sizes, and the one you extracted is probably the other. But they don't cost much and you can buy them where you buy dremel tools. Good luck, Al K

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3 Answers

I have a Dremel 300 and the shaft lock assembly isn't working to hold the shaft so I can get the collet nut loose. When I try to get the collet nut loose while holding the button of the shaft lock the...


The "nub" on the shaft lock assembly (internal) has worn down and the assembly needs to be replaced.

If you feel competent to open your Dremel yourself (and it's not on warranty) then order the shaft lock assembly from Dremel (early 2011 price: $1.25, not sure how much postage & handling might be). After opening the tool you will find a metal ring and a small piece (the lock) which it holds in place around the shaft where the lock button is located. Remove the old pieces and replace with the new ones and reassemble the tool.

Otherwise you can send the tool to Dremel to be fixed.

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My Dremel lock nut won't budge. My collet is stuck! How can I loosen the bit?


You'll need to use either the built in shaft lock to hold the collet in a fixed position, or use a pair of slip joint pliers to hold the shaft of the bit, while you use the wrench to loosen the collet. Slow and steady should get it loose. Another option is use some penetrating oil sprayed lightly onto the back of the collet to help loosen it from the shaft etc.

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Craftsman rotary tool doesn't lock down on the bits.


the collet is either the wrong size for the shaft on the attachment or is missing alltogether

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My collet nut is stuck and I cannot remove it. Is there a trick to removing a stuck collet nut?


remove all the star head screws, unscrew the top plastic collet holding the plastic outer casing on. take a pair of vise grip locking pliers open the plastic casing just enough to expose the inner shaft inside the casing lock the vice grips onto the metal shaft between the bearing casing and the collet that is stuck enough to hold but not to dent it up. now that the vice grips are locked onto the main shaft get an adjustable wrench and size it to the collet screw size and turn it should come off rather easily or at least mine did just did it as i wrote this then screw the casing back together and happy dremeling hope this helps

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1 Answer

Changing a bit on my dremel


Depends on the head you have on the tool. If it takes collets, you need to match the collet size to the shaft on the bit. There are I believe 4 different collet sizes.

You have the threaded shaft which is hollow and connected to the tool. then you put the proper sized collet inside that shaft and half of it will stick out. This is what actually holds the bit. Next, you put the 'nut' on the shaft, but don't tighten it yet. Put the bit into the hole in the nut as far as it willl go, then back it out about 1/8 inch. Now you can tighten the nut by holding down the button on the front of the tool until the nut does't turn any more. You can buy a 'nut' that works with any bit, no collets used, for about $10. Home depot, Lowes etc or online.

If you're not sure what I'm talking about, you can probably find pics of collets etc. by going to google images.
It would probably pay to contact Dremel or look online for the manual also.

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Do you have a 'nut' on the end, or just a wide open shaft (1/3 inch or so?)
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