Hi speed passes with fast shifting weaken the threads.

I agree. The lower knob was added to the AIM in March in 3 illustrations.
But it's confusing - 3895201 was replaced, but by the same number. 3895201 and 3895202 were in the early parts manuals, and then 3895201 was used with the 2-piece system.

My question is: if the early knobs were one piece, how did they lock them into the right orientation for the shift pattern?

More
 

I’ll add a little more to the subject. Was the 69 black 4 speed two piece the same as the 67-68 except tapped 3/8 inch for a Hurst shifter?

Thanks

I’ve seen a thin nut under the knob to lock it into the correct pattern

Look at this. Ha

X2, ha ha

That's not shows as being removed from the AIM nor is it in the early parts manuals. :(

Still looking
 

I’m still looking to buy this black shift knob for my 67 Camaro.

Thanks

Rich. I’ll sell you mine. Just have to find it. Jeff

Cool 😎, PM me later.