Today I checked the three gears and found the 331 and 334 gears to be very hard, whereas the 101 could be worked with a file. Still not soft by any means.
Both the 101's Splitdorf and the late Edison-Splitdorf have both round and woodruff keyways, or what is left of them. But the Split's woodruff keyway is a little more than 90 degrees advanced of the round pin groove, and the Edison's is slightly less than 90 retarded, with an extra shorter round groove in between.
When I mocked up the Edison on the 101 (using toothpicks for a key in its longest round groove) and pulled it through to where the front intake was closing, and then a touch further to where the camchest timing marks resolved, the points follower was on the small lobe of the advanced points cam as if ready to fire.
(I didn't expect that, as resolved camchest marks on a harley do not fall on the front advanced timing mark,...do they?)
All I can see of the flywheels through any of the inspection ports is ancient balancing holes. Time for a degree wheel.
I didn't try the 101's Splitdorf, as the keyways are extremely blemished, and I'm skeered to open it to see the points.
(Both mags were reworked for customers years ago by a local tractor wizard, and although homely, they have been tested to throw fire... If I open them I will have to fix them.)
The keyways in the gears are knarly as well, and the round ones are drilled at a weird angle that does not follow the taper.
It would be great to know what an original pin looked like, because the holes all look oval to me!
My 334 still had the woodruff key in the Edison's shaft that came with the basket. But it appears that using it would put timing between pointscam lobes.