I have a 2000 M Roadster. Twice while feeling "froggy" I jumped on other cars for an impromptu drag race. When shifting extremely rapidly from 1st to 2nd, I snatched the shifter knob off, and had to continue shifting during my "play time" with the rod only sticking up, with the knob and lighting wires for it trailing behind. My repair manual says that the knob is only held on by interference fit. What is the best remedy to keep it from coming off during "spirited" driving? Yes, I know it is not a muscle car, and should be handled more delicately, but old habits are hard to erase. For you BMW purists, you would appreciate this last drag race. I was on a trip to the beach for the weekend to meet up with my family, w/ the top down. While in heavy traffic I rolled up to a stop light on a 6 lane, and what do you know, but a modern (2004-2006) Pontiac GTO manual pulled up along side w/ a young marine driving. As I watched the light turn green, we both eased out and both immediately stepped on them. To my surprise, my M Roadster jumped out in front. I couldn't even hear my car's engine because I was right beside that bellowing "Goat". I went to 2nd, loosing the knob, staying a half car length in front, went to 3rd with the rod, with the GTO side by side. I backed off as we were now running 70 something in a 45 zone. The GTO continued on a bit further. I am assuming he had 3:23 rear gears, and I must have about 3:55 gears. That would level the playing field for my 3000 lb 240hp car to his 3900lb 360hp car. Pretty wild! Say's a lot for the little L6 S52 engine!