[69Customs]

Next take the modified knob, put it into the new crank handle. Put on the wave washer, then a 1/4" new flat washer. Not all flat washer are the same. If your lucky it will fit on the shaft as there is a landing that it has to go over. If not you may have to put the new 1/4" flat washer and put it in a vice and drill it out to .280-.290" dia. The closer you keep it to the shaft the less wouble you will have.
Next put a pan head 8-32 x 1/2" machine screw in it.
The knob should wouble all over. Take out the screw. Pushing in the knob and looking at the new flat washer, the shaft should be just a few thousands over this height.
Take a flat file and file the shaft down. Assemble machine screw and try again. The wouble should be less. Keep trying until you get the right height. Sneak up on it. It may take 4-5 tries. The die cast pot metal is soft and files easy. You need a file card or wire brush to clean yor file. When you get it to the right height it will feel just like the stock crank. The pan head machine screw is just like the mushroomed part of the stock crank. The plastic will keep the screw from coming loose or tightening up. If necessary you can put lock tight on the threads to lock it in.

Practice on junk cranks until you get the hang of it. This is what worked for me. Now all my knobs look the same.