A little more progress, the modified bolts are now clutch retaining spring posts and are welded into the back of the clutch hub.
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I also found out why the clutch had a bit too much oil in it. There is a seal on the end of the main shaft through which the clutch push rod operates. The end of the pushrod looks like an exhaust valve from a small capacity 4 stroke; the pushrod is about 5mm dia with the head that operated the pressure plate about 15mm diameter. The shaft had some scoring where the seal ran so I thought I would clean that up with some 600 wet and dry. I put it in the drill and the head was running out about 1mm so the pushrod shaft is bent. In the vice, I reduced the runout but could not eliminate it.
The rest of the time today I spent making rubber grommets for the cable routes through the cases from the electronic ignition and the alternator and looking for the flywheel puller tool that I have put in a safe place somewhere.