I am in the planning stage of a project and I have a few questions. I plan to build 2 axis. Both will be using 3 Mini V wheels (two 1/4" alum spacers on one side & one 1/4" Eccentric on the other side) bolted to a .25" plate. One will be on a 20x20 V-Slot Rail and the other will be 20x40 V-Slot Rail. What is the hole spacing on plate for 20x20 and the 20x40 rails? (I tried to find a drawing of the "Mini V Gantry Plate") Are M5 x 30mm the correct screw for spacers and wheels?