I've bought a Park Tool TS-2 Truing Stand with no adjusting screws. The caliper screw uses a 3/8" x 3" hex head screw and the arm angle screw uses a 3/8" x 4" hex head screw. The screws need plastic knobs to turn and adjust.

The finish cap is designed to tight fit and don't need glue.

The knob must be printed with bed printing supports.

Best print with PETG.