I had been looking for a suitable replacement shift knob for a while. My search took me to TWM Performance and their unique approach to a solution for BMWs. They provide a threaded adapter for the BMW shift lever that is secured with three set screws. Then the shift knob can be torqued down onto the threads of the adapter. The result is a very secure knob. I chose TWMs competition series knob and I am very happy with the product.
The packaging
TWM0 by
JMEllis, on Flickr
The packaging inside is very nice. The threaded adapter is on the left
TWM1 by
JMEllis, on Flickr
The result
TWM2 by
JMEllis, on Flickr
Jason