the crystal gasket may be different between the jf and noob? the thickness of the "wall" of the gasket varies between reps and gen, I've installed many gen ar xtals on the older BP and Noob 116610's and every time I had to use the gasket that came with the particular watch ,the noob gasket with noob watch ,the bp gasket with the bp watch, I would swap crystals only , every time I would try a gen gasket or a bp on a noob ,or a noob on a bp, etc. the crystal retainer which fits around the crystal and gasket would be too tight or too loose, the original gasket for each watch must be used in my experience ,so maybe this was the reason the jf and noob parts were NOT interchangeable?