I also have a Skunk2 shifter. I also had the problem with my shift knob not fitting on the shifter. I have the skunk2 shift knob as well. I thought the shiftknob would be a perfect fit with the shifter, since they are from the same company, but it didnt fit. I called the place where i bought the shift knob from and they said the same thing about the coating that acuradriva had mentioned. They told me to put a little muscle into it and it should fit. After doing that, i decided that coating the thread on my shifter and my shiftknob with some grease should make it easier to screw the shiftknob on. It worked. So i suggest if you are unable to screw the shift knob on, put some grease on the thread of the shifter and shiftknob, and it should fit.