I'd just glue the cam piece back in position.

yep ! Check the plastic cam as one of mine did that and was a white nylon type and not ABS or PVC type. Took a few different glues to find one that worked but it did. Also fixed one years ago using a micro drill thru the plastic into the metal shaft a bit and tapped a cut off micro brass screw into it, it still works too.

Great suggestions, thanks guys!
Any suggested glue? I just worry about metal/plastic contact, don't think Superglue would work.
How about plastic gun glue?

Quicksteel should work.

There are also a bunch of different types
Of multi-surface epoxies that should work
Just fine as well.

For any type of glue to hold adequately,
You will need to roughen up the surface to be glued
With sandpaper and then clean really well.

Yah, I'd go with an epoxy type.

kikendo wrote on 2021-09-24, 15:13:

How about plastic gun glue?

Not the generic craft type low temperature stuff. But if I found that all I had was the industrial high temp gun and multipurpose yellowy/beige glue, then I'd slide the cam as far up the shaft as it went, apply a coating round the shaft where it goes, then hold a soldering iron on it the opposite side to keep it nice and runny, then slide the cam into position and let it set up. .... and I'd only be about 60% confident that that wouldn't just make a mess you had to clean up/off before you got some epoxy because it didn't work.