My Dremel nut is stuck can't get off looks like it is stripped

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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HEY, STEVEN, I'VE A FIX FOR YOU!

I encountered the SAME PROBLEM in recently (Spr. '18) fixing our GE washing machine. I nor my very strong friend could remove the agitator coupler cap from the drive shaft = it was impossibly stuck. WHAT DID I DO? I CUT IT OFF WITH A DREMEL. The coupler cap is a cheap part (like $12), so it was/ is sacrificial. The trick therein was to be very careful not to damage the shaft --> I cut through the cap very close to the shaft w/ the Dremel, then used a hammer + chisel for the final knock-off.

After the coupler cap was removed, THEN I FIND THE HUB NUT ALSO IMPOSSIBLY STUCK! Not even with a spanner wrench could I remove the thing. MY SOLUTION? I CUT THE HUB NUT OFF WITH THE DREMEL, TOO. Same concern therein: I'd to be very careful not to damage the drive shaft. So I employed the same process: I used the Dremel to cut as close to the shaft as seemed prudent, then chiseled off the nut with a few hammer knocks once the nut was 95% cut through. As w/ the coupler cap, the hub nut is a super cheap part to replace.

HOW DID THESE PARTS BECOME SO STUCK, YOU ASK? My only thought was that the person who'd our washer before us (we purchased it secondhand) might have used excessive amounts of powered detergent. The excessive detergent that didn't dissolve during wash cycles got lodged up between the drive shaft and agitator coupler cap/ hub nut threads & made these parts impossible to budge (seriously, my friend and I used all the leverage/ lubricant we could muster/ creatively force). Just like how grit particles can fill the gap btwn any moving parts and then seize them.

VOILA! IF YOU CAN'T REMOVE IT AS EXPECTED, (CAREFULLY) CUT IT OFF & REPLACE IT!

** 1 - The first image below shows the agitator coupler after I'd completely pulverized & removed it from the drive shaft (I'm holding the remains last to be removed). 2 - The second image shows the hub nut after I'd cut through and removed it. 3 - The third image shows the newly installed replacement hub nut & inner tub base hub (the old tub base hub was completely corroded through & the need to replace it was what initiated the entire fix). 4 - The fourth image shows the newly installed replacement agitator coupler cap. **

Perhaps the best thing to do is get a second dermal tool with the appropriate size nut. I saw where Harbor Freight had kits for as low as ten dollars.

that would be the first place I would look. For replacement parts contact them at dremel.com and they can help if you can't find them locally.

To use the flex shaft, you need to remove the bit collet. Included in the kit is a nut looking item--mine is silver. It has a square end and screws on to the end of the dremel. It is simlar to the collet, but is slightly smaller. Then you place the square end of the flex shaft into the nut and screw the shaft on to the dremel.
Hope that helps

unscrew the collet nut, and then if it's still stuck, tap the end of the bit on the table or something solid. It'll come loose then.

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.

I'm guessing, but I think that the Sears tool uses the same flexible coupling. If you go to www.searspartsdirect.com and put in the model 572610031, you can look at the diagram and decide for yourself. I think the part costs $2.57. If it's the right one, I'd order two or three for the future.
Hope this helps.

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

HELLO ,you must keep your thumb on the push button while trying to loosen the nut it sounds like your pushing the pushbutton in and then letting it go as you try to loosen the nut , i also have a dremel and i made the same mistake when i first got my tool , Hope this truly helps you get it off , I thank you for letting me try to help you Sincerely Glenn