I always time mine to line up at like 11:58 and then just snug it by hand with a wooden dowel or a pin and using loc-tite only if need be or if the guy requests it. Ive never had one back off and I never glue em on, but im spoiled and grind mine to fit ^-^ Sometimes it doesnt take much, On a 24 thread pitch one degree is about .00011" but using a crush washer you would probably want to stay near those numbers 98 posted 20ft pounds or so.