This inclinometer was great for the first 14 hours of use. The locking bolt then strips the threads in the cast body. I am a trained carpenter and treat my tools with respect. I just used strong finger pressure to tighten the screw and was pleased with how well it held the angle until I GO! This is a tricky mechanism that drives the plain end of the bolt into a tapered brass washer to depress the blade. As long as the threads are not knotted. save your money
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