ORIGINAL: combatpigg
This thing is probably a gizmo that minimum wage ''techs'' use to QC servos with before packaging. A guy from the marketing dept. saw it on his way through the plant, a light went off in his head and it has now become another one of those ''must have'' gizmos for the public.
...or it could be a pretty cool tool to set points, throws, and other things on servos, especially for people without the most expensive radios. This thing works fantastic for things like dual elevator servos, or if you don't have individual servo endpoint adjustment on certain channels of your radio.
My hypothesis is that 'burning in' is a layman's term for testing the servo through it's full range of motion to ensure smooth, lubricated travel.