We have always suggested scoring the rear lip of the cap, vertically with a chisel, and that gives the replaced cap grip in the hub. We also don’t suggest a rubber mallet, though shot hammer, or wooden block and ball peen hammer is better. Consistent strikes are important as well as using the block for a flat pressure on installation. Impact wrenches are not STRONGLY discouraged for installing aluminum wheels. Bass Cat lubricates the acorn nuts and studs. Impact wrenches are not used to install wheels at BCB due to chattering on the aluminum wheels when the nuts tension. We experienced wheel tension failure (loose wheels) when the material wears. The chattering is gaulding of the aluminum wheel to the steel, that can build up aluminum on the acorn nut face. The gaulded material compresses in bead like chunks that flatten on the nut. This will bee seen as almost microscopic gouging of tearing on the wheel nut seat face. That’s where the aluminum was torn out by the impact wrench. Today we grease the nut and stud, use a four way spinner wrench and we torque every wheel to 98 lbs. at three different stages (3) at BCB to insure they are tight. That includes those we are shipping on trucks and we must remove prior to shipping
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