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How do you install a lock pin assembly in dremel 400

The collet was rusted on to the shaft so I had to take it apart to free it. It's free but the lock pin assemble moved in the process and I do not know where it goes. Dremel sent a blow up drawing but it does not show where it should be installed.

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Posted on Jan 02, 2017

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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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SOURCE: Dremel shaft lock spinning

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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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!

Jun 30, 2016 | Dremel Model 219 5-amp Solid State Motor...

1 Answer

Collet on my dremel is jammed and the hold button is not strong enough to keep it firm while trying to unlock it.


I would hate to try to jam something into the fan, so I think it would be safer to split the case open and then put the armature in a vise. I am pretty sure you can still do that with this model.
Another alternative would be to use an air impact on the collet, since it works on inertia and does not need the shaft to be locked. Of course then you would need to be able to slip a socket over the collet hex part, and you may have to cut off a bit in order to do that.

Feb 28, 2011 | Dremel 400 Xpr Rotary Tool

1 Answer

I cant loosen the bit on my dremel variable 395. The hole that the 'stop rotary pin' enters which stops the shaft from spinning is stripped out. The pin will not stay in place when I attempt to unscrew the...


Clamp the bit in a vise or with vise-grips (you will probably ruin it) to hold it while you loosen the collet. You can disassemble the tool and get the lock assembly P/N 2615297356 from for less than $2.00. Search for the part number on line for a source.

Jan 06, 2011 | Dremel Variable - Speed Multipro Rotary...

1 Answer

Can't unscrew collet


it is possible that you stripped lock mechanism on the collet, for the beginning, never, ever, use wrench to tighten the collet! just hand tied, if it slips, tight it bit more, but with hands only.

i never used wrench on the collet and never have any trouble with any of my dremels.

to close, just hold firmly in one hand pressing locket button, tighten up with other hand, to undo, reverse procedure.

if you find bit is too lose, then you have collet inserts, find that one which hold bit firmly and use it on this particular bit. standard collet is 1/8" (3.175mm), but in the set there are collets from 0.0394'' (1mm) to 0.177" (4.5mm). do not use wrench...

just inspect now if thread is not stripped, on spindle and on collar, if locket still hold, if these are damaged, you need to change damaged part. and follow the advice :-)

if you find this advice useful, pleasae do not hesitate leave your remark and vote4 for me, thanx!

Jul 31, 2010 | Dremel 400 Series Xpr Rotary Tool Kit with...

1 Answer

I have a collet nut that will not loosen. at one point while turning the shaft lock button pops up; even when pressed


Sorry, but I seem to have ( essentially ) the same problem... no positive lock. holding the button down while rotating the shaft to find the "best hold" then applying extra pressure sometimes helps. I had no problem with an older model. 400 XPR also seems to overhheat badly.
My ultimate solution: purchasing the model 4000.

Apr 25, 2010 | Dremel 400 Series Xpr Rotary Tool Kit with...

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.

Feb 16, 2010 | Dremel 300-N/55 300 Series Tool Kit

3 Answers

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.

Jul 17, 2009 | Dremel Variable - Speed Multipro Rotary...

1 Answer

Flexible shaft not working all-in-one rotary tool


check and see if you have the right collet insert in the chuck if it is too big it wont lock the shaft. does the chuck turn? if so your collet is not locking the flex shaft

Jul 09, 2009 | Dremel 400 Series Xpr Rotary Tool Kit with...

4 Answers

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

Jun 27, 2009 | Dremel Variable - Speed Multipro Rotary...

1 Answer

Dremel shaft lock spinning


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?

Nov 13, 2008 | Dremel 300-N/55 300 Series Tool Kit

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