Sanding belt stand for an RS550 12V DC motor that can be commonly found in many cordless drills.
Use M3 nuts and bolts to put everything together. For attaching the arms to the rails you can use hex head M3 bolts and butterfly M3 nuts to make adjusting the belt tension easier.
The rod connecting the two “rails” is for rigidity only, not for the belt to go around it.
Kudos to the author of the original, as it made my work much easier.
The author remixed this model.