Tyler and speedy, thank you. It seems the cam is part of the flywheel itself on this thing? I'll have a closer look when I get some more time, but it'll only open the points when it's installed and I've removed the "viewing window" in the flywheel. It's making getting a feeler gauge in a right pain. And this one I'll need to retime "using a piece of cardboard" according to the manual.

It's not a dumb idea norm. I don't have any spares kicking around though. I'd thought about buying one just to try. If it doesn't work, I've got a spare.