I got a "deal" on a Stronglight crank on ebay. It is new (or new old stock) and has French threads (14mm X 125).
I found some nice vintage looking Olimpic (Spanish) cage type pedals also with French threads. I am in the final stages of putting this Zeus Competition back together and found that the threads are very loose. The pedals flop around in the crank arms until they are fully threaded in. I know they will not hold up for long. I took it to a machine shop and determined that the pedals are on the small side, and the crank bores on the large side, so I have a perfect storm of tolerances at their respective (and opposite) outer limits. The machinist recommended JB weld! It is hard to put JB weld on brand spankin new parts! I have the option of buying a new set of 9/16" pedals and tapping out the crank, or gluing it up and riding it. What would you do????? Your suggestions are appreciated.