Love your tangent; in German, we call it „im Uhrzeigersinn“ literally „like the clocks mind“ or and „gegen den Uhrzeigersinn“ meaning „against the clocks mind“
Amazing project, and I loved your storytelling! I've always said "clockwise lockwise" which is very stupid, but I despise the usual saying. I'll definitely be using your right hand rule trick.
Almost all of the chain drives I've ever seen in machinery have a spring loaded tensioner in them. I think with that length of chain it wont take much wear for the chain to start jumping. Also totally agree with you on the thread direction mnemonic, but I always just memorised it and then had to think twice when reaching around behind a bolt.
Not sure if you have a mag drill? I've drilled clean holes in large pipes using a mag drill stuck to an I-beam strapped (or tacked) to the pipe, before.
what if you have a collet block of, say, size 7, holding a collet block vice of size 6, wouldn't that give you an indexing of 42? Of course, errors compound, and I'm not sure fitting a vice in a collet block would end up too large... But maybe worth a try! Cool project, by the way! Always love your hyperfixation on weird machinery