so … as far as determining direction, would I be correct thinking left side is reverse thread, and right side is conventional ?

in other words:

left side = clockwise to LOOSEN

right side = counter - clockwise to LOOSEN

that way, pedaling would be a tightening force for both sides.

(1984 Peugeot P-17 in question)

thanks
ps: I tried the cup in the vise method but was reluctant to try too hard for lack of directional knowledge!