I have a few sanding blocks, but this one gets the most use. Design is a take off of a Wood Magazine article. The pictures are telling as to the construction. The only hidden detail is there is a plugged hole under the felt. It is for the screw that is epoxied to the bottom that attaches to the wingnut. I chose hardwood scraps that I had on hand. They consist of cherry and two different walnut species. The felt was a self adhesive scrap left over from a jewelry box project. It measures about 4×3”. The plastic wingnut is loosened to raise the top to change paper. It is tightened to clamp it. The felt helps by allowing a little give when flattening a board. Cork could serve the same purpose if that’s what’s on hand. After a while using it, I used a core box bit to route the grooves for my fingers. Makes it quite a bit more ergonomic. Simple thing, but it sees a lot of use.
-- Jeff, South Carolina