Bob asked:


>Is there a source for these X shaped bits besides finding used ones, usually in
a drill.  Or NOS that has been dug up.


Never seen any in the wild, but I have converted a few yankee style. Not a task
for hand tools, but not a difficult job on a lathe or mill with a little prep,
should you have the need. I used a toolpost grinder and an indexing disk in the
lathe. I doubt I'll do it again.




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