Are lock washers allowed? My students were using lock washers while waiting for the VEX EDR washers in transit. They were asking me if lock washers can be used.
You might have a look at this thread, dated October 2017.
https://vexforum.com/t/answered-rule-r7-c-regarding-legal-washers/43564/1
And also this:
https://vexforum.com/t/answered-r7c-and-use-of-commerically-available-washers/35232/1
Just be aware that official answers seem to get changed willy nilly. I don’t know of any form of “clearinghouse” to ascertain that old forum answers still apply. It got very confusing last year. Your best bet is to simply ask the question in the official forum and let them get annoyed because you supposedly didn’t do a search, even though the search is likely to turn up answers that might be obsolete.
Thank you!