Trying to fit a square peg in a round hole is not advisable. Neither is trying to try and fit a large spark-plug in a designated hole that is too small. Ideal Aviation's GT1-17L is a spacing gauge (.015-.019/.40-.5 mm) that serves as an accessory to the Model 2500A precision gap-setting tool, a tool used for all massive-electrode Champion spark plugs.
Used 7 on heavily oxidized Airstream. Sanded off oxidation. Presto changeo, an almost mirror-like finish. Will stick with Nuvite. Important to follow instructional video.
This is an amazing aid to my fisning. Something serious inland fishermen should have. My only regret is that I didn't have this over the last 20 years.
