Better Y carriage belt holder block for Geeetech Prusa i3 Pro B Aluminium

The Geeetech Prusa i3 Pro B has some good features but the Y carriage belt holder is not one. I was amused when told to "make a hole in the belt and then put a screw through it". Clearly not a design to last and sure enough, it broke after a couple of weeks.

I found the the replacement belt was thicker than the original. This has been designed in OpenScad with parameters so it could be easily adapted for other similar carriages. To fit it you will need 2 x M3 screws approx 18mm and 2 x M3