------>>ORDER 3D PRINT NOW!!!<<------
This is an apparatus that can be used as a counterweight for your polargraph. It has a hole at the top to be hoisted with a 3.2-3.5 mm ball chain. I designed it so that you can place a toilet paper roll with a diameter of 50 mm to act as a container for various types of masses i.e. sand, coins, washers, etc. You do not really need it if you are using coins or washers as the apparatus has a tall enough wall to prevent the coins or washers from falling.
This is a great companion for ball chain sprocket that can be found by clicking here.