Tight axles?

steel gasket between the backing plate and housing. fibre or foam gasket between axle retainer and backing plate. the lock washers are there for 2 reasons. one to lock the bolt up and the other is to space the head of the bolt away from the flange. see most bolts have a radius on the under side of the head and that radius must not contact the flange material before the flat part of the hex. very important to have the back side of the axle flange bolt holes to have a counter sink so that the radius does not contact the sharp corner of the hole. with that done stud lock and proper torgue and you are good to go.paul