If i was making a custom plate. to mount wheels for a 60mm vslot what distance above and below the vslot is the centre of the hole? eg. 10mm above/below extrusion is centre of hole for the regular wheel.
The official position is section depth + 19.8 mm for the center to center distance of the bolt holes. In the real world however I find the distance on completed assemblies measures up to section depth + 20.3 mm. (... and personally, I just use section depth + 20 mm because it is so much easier.)
