Try having someone else hold the start pedal down and tap on the battery cable terminal of the starter with a small hammer. Don't pound on it, just give it a moderately firm tap. If the starter cranks the engine, replace the switch.
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!