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One technique to minimize chipping and splintering when cutting fiberglass with a hole saw is to run it backwards. Steady pressure will cut the hole, but with it turning backwards the teeth will not dig in like they do when turning forward.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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