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Anyone know a good source of REVERSE-threaded bolts & screws??

Thanks. That's a great source. The stuff I'm interested in comes in single item or packs of five. Not bad.

FYI, another source that sells in small quantities is The Rusty Bolt Shop -- but I don't see any reverse-threaded bolts (AKA, "Left-Hand").
 
How many and what size?

(I am a machine shop instructor and have my own shop, I may have what you're after in the quantities you are after.)