My (50 years in the business) A&P has me replace the gaskets each time I
clean the plugs. I never reuse them. He as all the nice equipment that you
mentioned. Easy job.

My mechanic is also very old school. (42 years as an A&P/IA) He's also a
former Grand Champion EAA and AAA home-builder. He's also the guy who
overhauled my engine.

The guy knows his stuff.

If he says the washers can be re-used, so long as you make sure they go back
on the same way they came off (so that the perfectly mated side matches the
under-side of the plug), I believe him.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"