I'm in the middle of putting together a design for a V-slot built CNC router, and I'd like to get some clarity please. Because it's looking likely that I'll have to get custom plates cut for me, I need to nail down some dimensions - Am I right in thinking that the spacing between the center of the eccentric spacer hole and the center of the 5mm hole is 39.7mm, for v-wheels to ride either side of a single 20mm wide v-slot section? And 39.7+20mm for a double wide v-slot section?