This is why it pays to keep a close eye on your motorcycle folks:
And then I went over to the timing side and noticed that this other nut disappeared:
It is a huge load of work (potentially dangerous as you're messing around with the three retaining bolts in the crankcase, not to mention crankshaft and layshaft alingnment, rotor nut, woodruff keys, diaphragm spring, etc.) and all just to replace one bolt.
I mean, there's no other way to do this properly. But anyway, one thing at a time, I'll finish the top end first and then see what I can do about this.
I may need to get creative here, purists be warned.
So, let's not forget that just because you don't feel vibration on a Commando, that doesn't mean all those horses aren't constantly trying to break free of the pen.