Question about Dremel 400 Xpr Rotary Tool

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I have the dremel and the part where you can put a drillbit it wont open how do i poen it

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Put it in a liquid solvent that can take the dirt out of it if not buy a new one.

Posted on Oct 14, 2010


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Posted on Jan 02, 2017


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You will have to remove the plastic cap on the end of the tool where the tips go in. Then screw on the cutting guide.

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If this is a dremel tool go to and download a owners manual for this tool, They also have a toll free tech number for assistance.

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I cant loosen the head on the dremel 300. When I push the button and try to remove the head all I can hear is some clicking and it just wont let go the attachment

Another suggestion: you could put a point on that rod with a grinder or a file, or a dremel, and it's good as new.


Could I get a "problem solved" / "fixya" rating on this -- there are icons at the bottom of this posting I believe.


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Want to reprogam keyless lock unican push button lock please advise ------thankk you...

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1 Answer

Changing a bit on my dremel

Depends on the head you have on the tool. If it takes collets, you need to match the collet size to the shaft on the bit. There are I believe 4 different collet sizes.

You have the threaded shaft which is hollow and connected to the tool. then you put the proper sized collet inside that shaft and half of it will stick out. This is what actually holds the bit. Next, you put the 'nut' on the shaft, but don't tighten it yet. Put the bit into the hole in the nut as far as it willl go, then back it out about 1/8 inch. Now you can tighten the nut by holding down the button on the front of the tool until the nut does't turn any more. You can buy a 'nut' that works with any bit, no collets used, for about $10. Home depot, Lowes etc or online.

If you're not sure what I'm talking about, you can probably find pics of collets etc. by going to google images.
It would probably pay to contact Dremel or look online for the manual also.

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2 Answers

Dvd 4600

DVD tray will not open, the display comes up poen but the tray doesn't come out.

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