i always did on mine i just double-nuted it and screwed it in. but since then i herd that as the stud tightens down and bottoms out in the crankshaft threads it can cause some run-out. either way is probably fine. as for break-in i would rather use an 11x5 or maybe a 10x7 that way you can still get normal operating rpms just at a richer needle setting. good luck they can be tight!