Cylindrical Surface Sander

This wasn't my idea, I must say. I borrowed this tool after seeing it on Aliexpress. It seemed very convenient to me for working on curved surfaces. And since they also sell a 3D-printed model in the store, I decided to make a few modifications, including adding my own screw knobs. As for how I assemble them, many of you may have already seen it in my previous works. But for those who are new here, here's a brief explanation: I tap an M3 thread in the knob, screw in the screw and fix it