Question about Dremel Variable - Speed Multipro Rotary Tool 395

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

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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.

Posted on Jul 24, 2009

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Same thing happened to me... the collet rusted to the tool, and the collar froze as well. I used penetrating oil to loosen the collar, but ultimately, I had to disassemble the tool and use vice grips and pliers to remove the collar. Once off, I put a drill in the collet to fill the void and gripped it to twist and remove. Naturally, all four leaves of the collet broke off, leaving the remainder of the collet in the tool. After trying to thread the remains with a tap, I gave up and used a couple of drill bits to hog out the collet stub.

I don't know just how screwed up the tool balance will be having scored the collet sleeve, but I'll find out tomorrow... after I buy a new collet.

IMPORTANT TIP: Remove the collar and collet when storing the tool... This was a PITA.

Posted on Aug 30, 2009

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Remove the plastic nut covering the shaft. File two flats on the shaft on the raised flange just out from the bearing. Now you can use a spanner to hold the shaft while unlocking the nut anytime you have a lockup.

Posted on Apr 22, 2010

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