Chris, It’s been a number of years since I removed the flywheel knob. Going from memory, on the underside is a screw. That screw goes all the way through the knob to the top and is finished smooth to the top of the knob. You’ll have to somehow hold the knob to keep it from turning and back the screw out. Then you can remove the knob, spring and screw. That leaves an insert in the flywheel. You’ll have to machine/make a punch that goes into the insert from the top that has an outside edge that mates with the outside edge of the insert so you can drive the insert out from the top to the bottom. Once you get it out you should notice the insert had a slight flare on the underside edge. That is what kept it from going out the top when pressed in from the underside.
Hope this helps,
George
