How do I fix a Dremel 4200

Question edited for clarity, spelling of Dremel.
Question moved from Cameras Category.

How to strip and replace the locks.

https://www.google.com/search?q=Dremel+4200+and+the+blue+unlock+tabs+are+stuck+on+unlock

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Yes it does. If you have any questions call Dremel hot line. They're sharp.
More details Complete Dremel Workstation 220 Review

This has to be worth a go:

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

No.. the issue issue is the switch inside. when your Dremel 4200 stop working, press firmly the grey area between the speed selector and the brush housing. I think this a defect in the design of the 4200.

Dremel has all their replacement parts right on the shelf at walmart, brushes, caps, chucks, the works. You found the cap, the brush is a little carbon square attached to a wire with a spring on it. Real simple. Buy a pair and get it fixed up. My favorite tool.

The attachment is 'keyed to the motor assembly so it will only go on in one direction. If it was mistakingly forced on in a different manner it can get jammed. Try twisting it from left to right while pulling straight out.

No. As you were assembling the wire from the fan motor to the house wiring, there should have been two wires labled. One would have been labeled "FAN" and the other "LIGHT". To properly attach the wires, (be sure the power is off) twist the thin labeled black (FAN) and blue (LIGHT) wires together. Now attach those two twisted wires to the black house wiring with one of the supplied wiring cap. Finally attach the thin white wire to the white house wire with supplied wiring cap. Your fan is now ready for operation. If you had performed all these steps when you first assembled the fan, then the thin black wire going to the fan has come loose. Should your ceiling fan still not run after all that, then it's time to return it where you bought it because either the pull chain switch is defective or the manufacturer produced a defective piece of merchandise. If you found any of my suggestions to be helpfull, please rate my solution. Thanks D. Lange

The Dremel 275 (and other series) have a plastic coupler and spline that connect the motor shaft to the collet shaft (where the tools attach). The plastic fatigues and disintegrates, causing the collet shaft to stop, even if the motor is still running. The fix is about $5.00 --- two parts from Dremel. The 275 case is a **** shell that opens with the removal of six T-10 Torx screws.

My Dremel 300 came without any instructions, so I had to puzzle out how to use the circle cutter. None of the images I managed to find on the Web or elsewhere were any help. I directed my attention to the "spike" on the circle cutter, and eventually I realized that it was on the wrong (top) side of the cutter--perhaps for safety's sake. When I removed it and positioned it on the bottom side of the cutter, things became clearer. The next thing was to locate the correct cutting edge. I had never used Dremel before, so I didn't recognize the cutting "bit", since it looked like a drill bit. The final problem was how to attach the circle cutter to the Dremel tool. I couldn't see any way of fixing the cutter to the tool. I thought perhaps there was something missing--a connector, perhaps. Eventually I found a reference on the Web to "removing the cap" on the tool. I hadn't noticed a "cap", but when I gave it a turn, it began to unscrew, so I knew I was in business. Finally II tried the attachment out on a piece of scrap timber, I found that it worked. A simple instruction manual would have saved me a lot of time. Also, I now discover that the Dremel 400 would be much more useful than the 300. Dremel don't seem to be very customer friendly. I can access the US site, but the UK and Germany website won't let me in!