I've seen some home brewed valve lapping jobs by chucking the valve stem in a reversible dill motor and spinning the valve back and forth by pulling up on the stem and alternating directions of spin. It doesn't beat a good valve and seat regrind, but it's better than nothing.
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!