00247 wrote: The collar has a slotted 1/4" countersunk oval head bolt. It slides most of the way through the shaft but then is threaded in the shaft as well as the other side of the collar.
OK - now we may be getting somewhere. Maybe what I'm dealing with is a messed up screw whose head was previously broken off? I would have thought so since I have a similar pin on my extra crank but I'll think about it.
Some facts which I hadn't thought to mention until now.
What I call a pin does turn about 1/4 turn but then stops turning. Believe me it does not want to unscrew. That said, there is about 1/8" in-and-out play thus suggesting this is not a screw.
https://imgur.com/SR7uA4y
On the other side where there is no pin (https://imgur.com/wl4XKLv), I tried first pushing with a punch (thinking the "pin" might go all the way through) and then a high quality metal drill bit). No luck. I bottomed the drill out in hardened (manganese?) steel leading me to think there is a different pin in each side of the collar.
I realize you guys can't do the work for me so I'm going to have to figure this one out.
I do greatly appreciate your thoughts, write up, and pictures.