So finally we come to what you could have made clear from the start without the desultory, time-wasting back and forth. The industry in which you are involved and for which you would not consider hiring someone who believes objective data is one in which you imagine there is some benefit to lock washers in assembling crap.

It sounds as though you are using lock washers as a compliant element to avoid crushing fragile components rather than to prevent unscrewing - so outside the scope of this discussion.