Can't keep your girl friend off your shifter? Guess what I found out. A 1/2 inch NF die will cut threads on your shifter shaft. (Possibly some meteric size will also?). Took my shifter knob off. cut threads down to the first set of pinches in the shaft. Backed the die up. Carefully filed down part of the first pinched portions on the shaft. Cut threads about half way down through them. Theaded on the jam nut. Threaded on the insert (adapter). Put some thread locker in the threads of the Hurst shifter and threaded it on. Adjusted it and there you go! Many shifter knobs will fit this size so look around. Just need some flat black paint for my shaft in the morning and it will look great. Time 1.5 hours. Cost foo Hurst T 22.00$. Borrow a die!