This shot is a lot harder than I thought it would be. It's well built and the threaded parts feel sturdy and won't wear out anytime soon. You can buy this with confidence. I will say the punched hole is not as deep as using a hammer and punch, but that's to be expected. "Correction" for impact force doesn't seem to matter much. The notches are definitely different in size/depth, but not by much. See photos. A mine with the lid unscrewed worked best for me. About 4 threads break. Max with the cap fully screwed on. I stamped aluminum and steel for reference. This works on wood, but you don't need a percussion mechanism since you'll get your groove before it starts to engage the spring. For wood, this is basically a heavy-duty awl.
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