I have one and it no longer grips the bit. I tried tightening it with the supplied allen key but it seems there is no bite and the key just turns. Does anybody know if by undoing the nut where the quick release lever is one can get the insides out, as I have seen it is possible to buy the collet and retaining nut separately, which I could then replace.
I have since bought a chuck handpiece which I find much more useful, but still it would be a shame not to be able to fix the quick release.
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