Geeetech Z-Top mount i3 Acrylic

My Printer model Prusa i3 Acrylic provided no real bushing solution for the thread rod in the Z-top mount. It just sit in the acrylic plate and grind out the material.

This part can be replaced by my modified solution.
Additional you need:
2 X Ballbearings 11 X 5 X 4 (mm)
And both thread-rods from the Z-Axis must be modified to 5mm in diameter on the lathe machine about 16-20mm from the top, just to snug into the ballbearing.

Tip for X-Axis: place the stop Rings to the inside, rather t