Here are an original Pentax ME ME Super Rewind Knob.

It is the genuine Pentax part, directly from  broken cameras

The knob also fits Pentax K1000 as substitute, but it is not the original K1000 knob

The part is used but in good shape 

You're supposed to have a male screw spindle in the camera when you order this part

The auction is for the rewind knob only. I assume you have the male screw shaft in the camera,