[modeleng] Piloted "D" Bit

I need to make a "D" Bit with some extra reach to it
in order to counter-bore some Allen head bolt seats in
a hard to reach place.  I plan to make it out of
Silver Steel and harden it.  How  it is possible to
make one wherein the "pilot" won't warp during the
hardening process?  I've tried it a couple of times
and the pilot wants to warp when quenching out.  TIA

Al Messer


      
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