Especially when pulling back on it to hit first gear...the knob comes off. Unlike any other import I've had, the knob doesn't seem to thread on. The shaft (too many jokes here) is not threaded, and when I peer into the inside of the knob all I see is a metal "cup" that appears to be a crimp type fitting over the shaft. It does get tighter if I turn the knob clockwise once it's on the shaft. What's up with that?

factory knobs attach to the shifter shaft with a crush sleeve..it looks like a metal piece of corrugated cardboard.
Once a knob is taken off they are pretty much useless. You need a new crush sleeve and all will be good again.
Might as well polish your knob while you have it off

I'm glad toI know that. I'd better quit taking mine off. It may not fit next time! Seriously, I've never encountered this and I've had mine off several times. I may have an extra wave cup washer if you need one Ken.

I appreciate that, but you may need ti. Does anybody sell these?

I have found them at autozone. Its just a crush sleeve for a shift knob. Put in a rennshifter and you can go back to using threaded knobs again.

Zach

PET shows 999.532.001.00 spacer; looks like it could be the part

Mark sells a crush washer !!

(Sorry, had to edit out UK political commentary - Clay)

Thanks!

Now...to get the old one out of the knob!

Ken, these are available at the local Porsche dealer, AA, PP, GPR, Pelican, etc., etc. & not too pricey, so get 2 since you apparently like playing with your knob anyway!

Some long-nose needle-nosed pliers will get the old one out.

Then as someone else said above, go ahead & polish your knob while you have it off, & might as well stroke the shaft until shiney too!!!!