The lock washer shown on the IPC is no longer available. I’ve changed 4 versions of cams over the years and asked the specific question each time (along with the lock washer for the thrust plate screws- albeit these now appear available) and the response was loctite green.
Applied properly loctite is a ‘proper’ solution and acceptable in place of lockwashers.
You may be able to fashion a suitable fixing but why when there is a perfectly acceptable (and recommended) solution?
There are stronger solutions than green and I believe 262 was identified. However, it can be a pain removing and I’m adverse to using heat even though it’s unlikely to do damage (but to ally cam gears??).
The most important thing is to prep the bolt/cam thread with a proper proprietary preprep. I use loctite 7063.
https://www.henkel-adhesives.com/uk/...e_sf_7063.html
Some people swear by brake cleaner/carb cleaner but that can leave a residue. 7063 has been developed for sealing fixtures and very economical.
Russ