Would somebody be able to trim the outside diameter of a collet sleeve down from 6.35mm (1/2") to 6mm for me? I'd like to be able to use 3.17mm bits in my 6mm chuck. However I can only find reducer sleeves that go from 6.35mm to 3.17mm.

Please let me know how much you'd want for the work.

Alternatively if you know where I can buy such a collet sleeve please speak up!