You've got the right idea- - - -carefully roll the engine over until the piston gets close to the top, and use a bright light to shine into the spark plug hole. Once you see the tube, snag it with a piece of stiff wire with a hook bent into the end. A borescope would help, but most folks don't have one handy!
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!