Sorry have to disagree on that one.......they have a taper at the base of the stud to lock into the crankcase for the purpose of locking them tight........... Lock two of the 879 head bracket nuts together nipped up with a pair of spanners, use some thread sealant on the upper part of the stud thread........do not use a thread locker like loctite........if you do it will destroy the threads if the studs are removed in future. Wind the stud into the case thread and pull them up nice and tight using a normal length ring and open end spanner, then back off the two locking nuts and move on to the next one........ I always buff up the threads on both ends, and if the studs are the original steel items, I paint them first with some silver engine enamel in a spray can to stop the studs rusting............ Use either grease, oil or anti seize on the upper threads for the hold down nuts, this will allow a correct "Rolling torque" when you tension up the head nuts.......... Good luck.