I have created bed leveling thumb screws for the HICTOP Prusa i3. The original interfered with the rod mounts when sliding the bed near end of travel. These are easy to get a hold of and given their radial extent, torquing is easier for finer adjustments. Just print them out and press fit M3 hex nuts. When threading on, the nut should face away from the bed. This ensures the thumb screw does not come off.
Print with supports if you can't bridge the face of the hex insert.