The wonderful world of Imperial vs Metric ...
In Britain, although router bits come in both flavours - that is, in both Metric and Imperial sizes, their shanks are always either 1/4" or 1/2". However, I received from China this morning a couple of bits which were advertised as being 1/4" ... only they aren't. Their shanks are 6mm, not 1/4", and apparently the Chinese think that these two measurements are the same thing.
Now although the collet of the router these were intended for will grip 6mm at the working end ok, the other (non-gripping) end of the collet with have nearly 14 thou of 'clearance' present, and the prospect of a router bit spinning around at 10,000+ rpm perhaps being as much as 14 thou out of true, doesn't really appeal very much.
What's needed now is some kind of circular (tube-like) shim to take up the difference at the non-gripping end of the collet. Any bright ideas ?
LJ