Question about Dremel 300-N/55 300 Series Tool Kit
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
Just went through this problem. Only thing that worked was I happened to have a long needle nose right angle offset pair of plyers that could hold the brass shaft below the collet, while another set of vice grips held the square collett sides (these were flat jawed vice grips). You can use a light sticky two sided tape or a small piece of duck tape over the jaws of both these sets of pliers to save biting into the metal too much. Be sure to back the vice grips down on the flat sided collet and away from the shaft of whatever you have stuck in the tool and also to get closer to the reversing torque of the offset needle nose to generate the power to free it up without too much damage. The rest of the dremel can free wheel while you are counter spinning the vice grips in a counter clockwise fashion while gripping the offset pliers with narrow sharp nose around the brass or gold colored shaft. Worked for me without tearing up the tool and without sending it back. Still doesn't help with the cheapness of the shaft lock though.
Posted on Jul 10, 2012
Had the same problem---the lock is ruined inside.
Posted on Feb 28, 2010
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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