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Is there some advantage to this design of hacksaw or am I right in thinking it doesn't make a lot of sense. It has a threaded rod at the top and the frame is a pipe full of metal bits. I would guess those aren't supposed to be in there. Probably something missing.

The smell of butyric acid, or that vomit-smell that old screwdriver handles have is actually used to vandalize things. Link The handles are made of cellulose acetate butyrate and it doesn't matter if they're clear or not. I have solid-colored ones that smell the same. That butyrate part of...

I know that 24, 36, and 72 are the most common tooth counts for ratchets with 80, 90, and 100 becoming more common but when exactly was the time period when the jumps from 24 to 36 and 36 to 72 happened? I ask this because I have a ratcheting wrench with only 18 teeth. Gearless: 1950s (was the...