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Originally Posted by fan4chevy
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They have had em for awhile. They take a bit of work to "tune them" to get them too work right but they do work pretty good for a home DIY guy.
There are a few you tube videos about setting it up, putting a good bushing in it. My suggestion is to skip the cheap hole saw and get a good annular cutter for the size(s) you use the most often. They are costly but leaves a better cut and far outlives bi metal hole saws.