fancy version. Pivots are knife edges rather than tortion hinges. therefore no top counterweight is needed to counter the tortion resistance during balancing/tilting. The drawback is that knife edges wear as do their bearings (brass in this case)
I'm hoping this will measure up to about 5 kilograms.
Not finished yet.
add brass bearings in the center.
change knives to steel from brass.
Add calibration weights to lower arm
Add needle to upper arm, and a vernier to the top.