<R15> Last bullet (f) adds liquid nut tighteners. This should also include other types of lock nuts. Add: Jam, Nylon Lock, KEPS/K-lock, Flange and Serrated nuts are all permitted; T-nuts are excluded. (What about Wing?)
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Official Q&A: VRC 2023-2024: Over Under
1563: <R15> Most modifications to non-electrical components are allowed. (permit all nut types)
Answered by committee
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(What about Wing?)
Please see rule <R20>, quoted here for reference.
<R20> Certain non-VEX fasteners are allowed. Robots may use the following commercially available hardware:
a. #4, #6, #8, M3, M3.5, or M4 screws up to 2.5” (63.5mm) long.
b. Shoulder screws cannot have a shoulder length over 0.20” or a diameter over 0.176”.
c. Any commercially available nut, washer, standoff, and/or non-threaded spacer up to 2.5” (63.5mm) long which fits these screws.