[Walt Fricke]

What do you think Smith thinks about the ability of a wave washer to add anything significant to the stretch of a fastener? To be sure, Porsche used them in some applications, like under all those nuts holding the cam carrier onto the heads.

Loctite maybe, though if Smith is right about the tabs, with the standard torque for an 8mm stud, maybe any flat washer is fine with a standard nut. The washer keeps the nut from gouging the aluminum of the pump.