This is a little tool to help setup ball differential for RC car. It is made for Serpent Spyder SCT SRX-2 RM - car, but it can be used with all Serpent RC cars which can use Balldiff set SRX2 (#500186).
It locks Diff pully and one of outdrives, so you can find right setup for balldiff with free outdrive.
This is printed with PLA
If you get Elephant's foot to first couple layers, you must clean those with hobby knife or similar tool, so that ball diff fits to the cup.