Who makes affordable custom reamers?

Order a machine reamer by diameter, from KBC Tools, and freehand grind (or better, use a jig) the shank end to the size and shape you want.

Or...Look under "Tool and Cutter Sharpening" Or Tool and Cutter Grinding" in the yellow pages for a cnc grinder equipped shop and talk to them about what you need. They may be able to grind what you want out of something that they have on hand.

After that, you start into the aircraft tool suppliers and cheap is a non-starter.

Cheers
Trev
 
Buy a reamer from KBC and take it to a tool grinding shop, there are at least two in London that specialize in regrinding cutters. If you can get one close, like 11mm it wont take much to get it to that size. The price is reasonable.
 
Hmm, now for a European who is imperial-impaired, what's the nearest larger fraction of an inch for 0.419? Sounds like 7/16". Can that size be ground down?
 
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