I may use supported rails I bought these bearings before I found the better priced supported on ebay

I can always use them for a rail guided rip saw later or sell them on ebay

I agree with the height of the mount

i don't under stand why there is 12 bearings I will have to see when they come ?? I thought it was 4 bearings and 2 support bearings for the ball screw ??

O'well looks like I will be going 25mm supported on the Y,Z axis as well or sell the remainder

James