In the real world of auto repair back when mechanics were skilled tradesmen and not simply parts-swappers, untold thousands of rocker arms got resurfaced with those fixtures on valve grinding machines, without getting ruined. Yes, it takes some skill, something that will probably will never be seen again in today's throwaway culture.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!