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For some reason, I don't own a bathroom scale. Although I have heard of such things.

I am thinking of taking a round of heavy wood, putting an eye lag screw into it for my heavy object. Then I want to make lever arm and fulcrum that have different notches to try to see what lifts the piece the easiest and thn some block and tackle set ups for lifting it. I'd bring the GRCS but...

Parents go in to my daughter's school and give talks and lessons about things they're familiar with. I've though about two subjects, one trees and the other mechanical advantage. Trees are great and I think I could make interesting but like the idea of having the kids lift stuff with blocks...