Step 2: Construction
I used Plexiglass screwed to 1/2 inch plywood. In order to hold the slider (center movable piece) in place and still allow it lateral movement, I used a dovetail router bit to shape the edges of the Plexiglass pieces. This slight bevel holds the slider down, but allows it movement.
I covered the Plexiglass pieces with double stick cellophane tape. Then I pressed the paper scales to the tape. I covered the paper scales with cellophane packing tape about 2 inches wide. I trimmed the edges with a very sharp knife.