The original screws are very fragile and I had some malfunctions because the screw doesn't meet the switch correctly. Normally this screws are only adjusted one time, during building the printer, and never again. These both things replace the whole screw construction(s). No additional parts needed. Use the original Screw for mounting.
Repetier warns on the long Version but slic3r havn't any issue. These are my first steps with Sketchup. So maybe I have made a mistake :-)

Just print and mount with the original screws.