Fine detail sander
Made one of these at home.
Had an old electric toothbrush that ran on batteries, and I couldnt get new heads for it.
I didn't want to bin it so I cut the bristles off of a couple of old heads.
I super glued on small circles of wet n' dry paper.
It makes a really good sander polisher for fine work, removing seem etc.
When thw paper gets clogged, I just glue another bit over the top.