Running like a Swiss Watch.

So how far does it get before you have to rewind it?

Ha! Hasn't run down yet. Let you know if it does.

You must miss working on the old girl 😁

Nah! Always something to do when I get home. Currently scratching my head about how to make the gear change lever more secure. I can't seem to get enough hurt on the bolt that supposedly clamps the lever to the shaft, and mostly it's held in place by the small locating screw. Wondering should I try to drill a small hole 50/50 lever and shaft, and scotch key it? (lever might be softer than shaft, and drill will move into lever, missing shaft). Or perhaps drill small hole right thru and put a pin thru it. What do others do?

I'd suggest using a nice high tensile bolt that can take some more torque (unless you've done that !)
Can you show us a picture of the setup ?

It's just the standard setup with a split up the center and a pinch bolt. Always works well when there is a spline, however for some reason they decided a spline wasn't necessary. I think over the years, the shaft has worn a bit undersize making a tight fit just that bit harder. But will follow your suggestion and visit the hardware shop for a high tensile bolt, then tighten it til it is near stripping and see what happens. Might stop it from slowly slipping off the shaft as well.

Hmmm, yes, asking a lot without the splined shaft !
You could probably also add some Loctite 680 , but its rather $$, and may not help.

If you're happy with the position of the lever, you could mark the shaft at the location of the gap.
Remove the shifter and put a dab of weld on the side of the shaft and then shape it with a file.
Will act as a key to stop the shifter from slipping and a tight fit should stop outboard movement as well.
A high tensile bolt is probably the go as Speedzter suggested, and get a plastic chrome cap to cover the head.

Yes, the plastic chrome cap is the go, if I can source one. And a mild Loctite with a small 2 jaw puller for future removal. I'll let you know what happens.