***No hardware needed, knob post must be available***

I designed/made this awhile back to replace a lost/broken knob on a friends stereo system. The ID of the inner piece is 5.9mm and needs to be press-fit onto the exposed post. If your post is too big or small, measure the OD with a pair of calipers or whatever you have on hand and scale the model until the ID of the inner piece is roughly .1mm smaller and then apply gentle pressure to mount it to the post.

Once all of those steps are complete the knob slides on with a double key system that mates with the inner piece.