Some stinker at work thinks just because I work in the food industry I should be at the factory.

Still at the rate I'm getting though M2 taps at the moment I'd probably be better off out the garage at the moment.
Go hug a Stug mate.
I've read the for and against arguments for using flat and split ( helical spring) lock washers together over the years. On some engineering boards this subject is cause for "colorful discourse".... For your consideration I offer this article: https://engineerdog.com/2015/01/11/10-t ... fasteners/ .....for the references to scientific analysis on the efficacy of lock washers...Pete Nash wrote: ↑Sat Jul 13, 2019 5:48 am
The Motor mounting instructions call for a plain washer and split shake-proof washer. This is bad engineering practice. One does NOT use a washer and split washer together, the bolt will turn the split washer which turns the plain washer thus negating the effect of the shake-proof split washer.
To be an effective shake-proof device the bolt heat grips the split washer and forces it onto whatever its being fastened to.