I took Juan's Table Foot OpenScad file and used the top hole to clear the M3 nut and added a thru hole to allow tapping on to the M3 screw. That way the foot can attach to the mounting bolts and screw flush to the plate.

I attached the STL, but you probably should edit the SCAD file to match your needs and o-ring.

Thanks Juan.

If you want to follow along on the FunBot build you can check out this thread.
http://forums.reprap.org/read.php?166,429588

I attached the STL, but you probably should edit the SCAD file to match your needs and o-ring.