See: VSR Products

VSR Products have introduced the new Easy Ball Diff Builder to all common 1/10 scale ball differential components 3/32″ or smaller. Dealing with small differential balls during a rebuild is tedious and frustrating. The tool is designed to hold all of the diff balls in the main compartment, and then allows them to “pour” out the track in a single file line. VSR Products recommend tipping the Easy Ball Diff Builder over your greased diff gear, and tapping lightly on it to allow only one ball to exit at a time.