From video. Insert back tap all the way into cylinder in the retracted form. The tap has 4 external fingers that are threaded.With a tapered internal threaded rod.Piston down .Expand threads by tightening internal threaded rod and slowly screw tap out.From theory threads on inside are still good. I've never a had a cross threaded plug.Always been careful with aluminum head on small engines. It's one of those tools I thought might come in handy at my age ,yeah right(75).
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