[Funny]

I would say that you should reduce the coefficient of sliding friction to a minimum in the rub spot. Wear occurs much slower in areas that are smooth, like bearings or precision ground camshafts, for this reason alone. Just get some Teflon, slap it on there or some other very low coefficient of sliding friction material. Rollers like basjoos would be best. At the very least, one could sand and polish the rub points to reduce it.