VSR Easy Diff Builder tool
VSR Products have introduced their new Easy Diff Builder tool that fits all common 1/10 scale ball differential components 3/32” or smaller. It 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 recommend tipping the Easy Ball Diff Builder over the greased diff gear, and tapping lightly on it to allow only one ball to exit at a time. Diff balls are not included of course.
Source: VSR Products [vsr3d.com]