Had some problems with the screw slipping
so i change it to a larger threading (you need both parts)
remix from http://www.thingiverse.com/thing:916707
its a very tight fit , you may need to use a knife or something to make it go in first time
feets-base2.stl | 3.2MB | |
feets-screw2.stl | 2.1MB |