On your pic of 21st August it appears that it would be possible to screw the clutch nuts down a bit tighter. Have you tried that or do the springs become coil-bound?
Did your dad have the bike running satisfactorily or was the clutch always problematic?
I've had bikes in the past where the clutch springs have measured up OK but still been useless. I suppose that comes with people using what they have rather than buying something known to be suitable for the power expected to be transmitted.
While balancing the clutch springs once or twice they did get screwed in further, however I think the cups were bottoming out. It would certainly explain why I could see the pressure plate moving outward while pulling the clutch lever, and one of the cups was stationary until the pressure plate had moved a sixteenth or so.
From memory the clutch has always been ok, but I wasn't always privy to all the information from the riding the bike had. (Track days etc). It does follow the"philosophy" of the bike's entire build that the clutch would be built up from random found parts that didn't necessarily all match up correctly.
I've got proper pre-63 pressure plate on order, and a line on a replacement hub, so at the moment just waiting for things outside my direct control to happen.
