With this accessory kit, you can convert your balancing Balboa chassis into a traditional differential-drive platform with a low-friction ball caster providing a stabilizing third point of contact. The included ball caster pieces are held in place by a removable retention clip, and the whole assembly conveniently snaps onto the front/top edge of the Balboa chassis. This kit is also useful in balancing applications, where the ball caster can be left off and the extension piece can be used to make the Balboa taller and give it more mounting points. The parts for this kit are already included in the Balboa Chassis with Stability Conversion Kit.