Timing by vacuum- - - - -"Measure it with a micrometer, mark it with chalk, cut it with an axe!" That timing method went out of style approximately 75 years ago when strobe timing lights were invented.
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!