Are you thinking of Helicoils?
It will probably require drilling and retapping the knob, to the next larger
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
on 3/31/10 1:00 PM, Barrie Robinson at email@example.com wrote:
> I got a beautiful gear shift knob from Larry Heaps who can be found
> on www.britcot.com - it was for my under restoration Aston. But, as
> usual, Brit threads are different and it will not fit. The gear
> shift thread is 5/16 with 22 pitch, the knob is slightly larger than
> 5/16 with bigger thread. There are some inserts one can get but I am
> damned if I can remember the name and what they do. Can someone help
> here please? - Thanks in advance for responses.
> I tried plumbers tape and that was hopeless.
> (705) 721-9060
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