Sanding Brush

The idea comes from https://www.thingiverse.com/thing:2404850 but I would like to have a handle so that I can put more force when sanding. And I think a handle is more ergonomic for me.

The tool was designed in Onshape, the document can be copied and modified from https://cad.onshape.com/documents/d373da92e41c5865c53e56e0/w/ed03d1379559bf4ac71a542c/e/9b385080df95f52e312d10ad

However due to short of time, I didn't design screw, thus some may need bigger hole for the nuts and screw.