A c-clamp in any size you want. The provided STL file is for a #8 nut.

1. Procure a hex nut and mating screw of any dimension.
2. Open the c-clamp.scad file.
3. Use the following measurements as arguments to the cclamp module. 3a) nut_od: the nut at its widest part 3b) nut_id: the diameter of the screw 3c) nut_height: the thickness of the nut 3d) spine: the length of the screw 3e) throat: the desired depth of the clamp's throat
4. Compile, render, export to STL.
5. Print.
6. Clean.
7. Put the screw through the hole in the frame and screw on the nut.
8. Align the nut with its hole in the frame.
9. Turn the screw till the nut is pulled firmly into place.
10. Epoxy or glue the screwcap onto the tip of the screw.
11. It's going to be clamp this clamp that. Bada-climp bada-clamp.