Tool to balance piston rods

In order to get the correct balance of the rods I made this tool. Not only the weight of each rod must be equal but also the weight on the piston and crankshaft bearing side.

Just put the tool onto a dare which has an accuracy of at least 1g.

For balancing the rods just hang up one side over the ball bearings and hung up the other side with a hook and a long cord so the rod has a horizontal position.

Do the same but in reverse direction. If you have measured all 4 rods you know where you have to remove some material to get an optimal balance.