Sorry to come to this late. What you have appears to be a BSF 5/16 X 22
thread, and a UNF 5/19 X 20 thread incompatability. You will probably never
find a heli-coil for the BSF situation. Taps & dies are available for the
BSF threads. Moss sells the tap for 18.95, and the die for 45.32 (USF). The
best situation would be to start with a new, untapped gearshift knob, and
use the correct tap, but it is probably too late for that. It might be
possible to tap out the existing hole to the correct size for the shift
lever, since they are only 2 threads/inch different, and then to use a jamb
nut to tighten everything up. If it doesn't work, you are out a knob no
matter what else happens.
Good luck
Mike Singleton
Michael Singleton
Sportscars Ltd
10170 Croydon Way
Suite M
Sacramento, CA 95826
(916)366-0330
mike@sportscarslimited.net
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