Maybe someone else has use for this. Currently working on expanding a 500mm XC to 1000x750mm.
Note: I have not tested the solutions below yet. No guarantees 
9mm belt clip 2 v 2.stl (163.9 KB)
- 2 M4 20mm bolts
- 1 M5 20mm bolt
Y axis solution for those with wierd Y end plates:
- I made som taller Y end plates from 15mm ply and reused the metal plates from Inventables.
- Drilled out the old metal plates to fit a M6 eye bolt and attached them onto the ones made from plywood.
- M4 x 20mm bolt in the belt loop, electrical isolation tape. Will add a M4 nut on the bolt too.
- Reused some plastic spacers I found lying around.
