Originally Posted by Leigh B
Photographic threads are loosey-goosey because they're designed to work even if dirty or damaged.
I think you're right. Which is why I suggested that the actual thread used by tripod manufacturers is probably a modified form of one or the other designed to fit both.
"People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.