This is a great little sanding pad for 50mm velcro sanding disks, that speeds up sanding on a wood lathe. I have a video using it on my YouTube channel. And there is also a video where I built this thing by hand.
You also need to watch that video, because there I show how I glued on the foam backing material and the velcro.
Video using the tool: https://www.youtube.com/watch?v=S2Eq4o3B4d0
Video making the tool: https://youtu.be/BFaqKNRKvo8