So I think I got this figured out. I assumed the gear and the center portion with the two recesses were one piece but they are not.One mystery is the clutch/cone assembly.
This taper pin was almost out when I got the machine, the other must have fallen out some time ago.
But upon inspection I cant figure how it all goes together, if two pins this long go into the cone/clutch they probably go through the C clip shown here. But then in the gear there is a single hole and two shallow recesses. If they go in the recesses they cant seat fully in the cone and there is only the one hole.
Besides that if the pins go through the cone and engage with the gear body at all while it is released the gear will still be driven. Most likely the pin was a poor replacement that doesnt belong at all. Perhaps the pins originally retained the C clip, the clip was off center and slightly wedged against the lip on the cone so that might be it.
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It seems that the pins index the cone the C clip and the hub all together so that when the knob is turned the threaded shaft pulls the cone into the gear and locks the whole thing together for power feed.
What must have happened is the original pins broke off in the hub, thats why they look like shallow divots. After they broke someone drilled a new single hole in the hub and resorted to the single pin that eventually backed out.
My fix I think will be to match the "new" hole with another one, then open up and tap the holes in the cone for some suitable hex head screws then turn the threads off the end of each so they will screw into the cone securely with their protruding smooth sections engaging the hub as per originally designed.
This seems more practical for me than trying to drill taper pin holes and hoping they stay put this time in the cone that may well have been beat out of round at some point.
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