Zambezi you probabl;y don't need a belt sander, if you have rhino nearby.
Stand 100 meters from rhino, wave 2 fingers and verbally abuse it, it now rushes toward you, wait.... at the very last moment step to one side and press the side of the paintbrush against the rhino as it wizzes past.
Repeat the process for the other side of the brush and hey presto brush as good as new
Then RUN