Dremel model 365 type 1 collet lock latch is worn out.

Question edited for clarity to add Maker.
Question moved to Make Model category.

The lock button should lock the shaft. With the collet facing you, turn anti-clockwise with grips or pliers. They should never be done up _that_ tight. Try spraying with penetrating oil. Two version of the manual below.

DREMEL OF Multi 395

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the better products of its kind. • To get the optimum benefit from the tool we advise you to read this instruction manual thoroughly.

DREMEL Moto-Tool Owner's Manual

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DREMEL. Moto-Tool Owner's Manual. Models 275, 285, 395, and 595. 3. HONESTLY NOW... Have you read this. OWNER'S MANUAL? This manual will tell you how to get ...
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This has to be worth a go:

0 3 3 4mm Mini Electric Grinder Keyless Drill Chuck 3 4mm Shank for Dremel...

There should be a shaft lock button near the tip end of the tool and you need a small spanner wrench (included with the tool) that inserts into the collet sleeve hole and is turned CCW (looking at the tool end) to loosen the collet itself. Tap on the tool end lightly to help loosen the bit. Hope this helps!

Remove the collet nut and collet then unscrew the sealing cap (black plastic ring), this has the same thread as the inner of the multi kit tool, so just screw on the tool then replace the collet and nut

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!

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.

call dremel and ask for the part need you model number so have it ready Dremel Service Center Dremel Authorized Service 4915 21st Street 4631 E. Sunny Dunes Road Racine, WI 53406 Palm Springs, CA 92264 Phone: 1-800-437-3635 Phone: 1-800-275-2052 1-262-554-1390 1-760-327-3003

You can either go to Dremel.com and type in your model number for replacement parts or call their toll free number at 1-800-437-3635 and get that information. Let me know if you need anything further

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?

Unplug it, then while pushing in the little silver button near the head use a wrench on the hex nut and turn counter clockwise about a 1/2 turn. Push the bit in, then pull it out (that releases the little fingers that hold it).

The silver button locks the head so it won't spin while you are changing bits. Always be sure it is released before plugging in or turning on the power.