Will make the recommended changes tomorrow in sketchup, im getting square eyes now and RSI from that software, its good but frustrating!!

Also done some research on the rotating nut idea and like it a lot, need to make a few mods to allow it to work. Can you guys tell me which Blocks you use to hold the ballscrews in situ tho, are they FK blocks?

Also where do you get the actual rotating nuts from as I can only see the manufacturers, not any suppliers etc, Zapp dont seem to list them??

Any help would be very much appreciated!

Thanks again!!