Before anyone tries to block this thing again, I made it from scratch. Have the sldprt if needed.

It's a shift knob that fits M10 thread directly due to conicity of the bore.
Eventually it'll come lose, i've added some liquid epoxy glue into the hole and attached. It's rock solid and now has some inner thread.

I've made it to replace the rotten one of a ford escort RS, since the original one isn't avaiable anymore.

It's the 3rd review, the grip is awesome.