So I think I’ve got this figured out, but I’ll ask for a little validation before I tighten zip-ties…
Routing is from the motor side of the center. Next is a idler on the motor side of the roller. Then to the first motor, around and all the way to the other corner. In and around the idler that’s closest to sand. From there to the next corner, but the idler furthest from sand. Next to the other roller, through the idler toward the center. At the center it crosses the belt clamp through to the other roller and around the idler. Back to the corner, but in the unused idler. Crossing the previous stretch to the last corner idler. All the way to the second motor and around it’s pulley. Back to the last idler on the roller. Finally it ends back in the center. The two ends need to be looped and zip-tied a couple of times to hold on the spacer (would it make sense to have a washer on the outside of the spacer to keep things in place?). Tighten the belt appropriately with the zip-ties and fix the belt to the belt clamp. Finally slip the stop block onto the belt as appropriate to hit the limit switch.
With that layout my belt is reversed from engaging the teeth on the belt clamp. I’m assuming when I tighten a zip-tie to the belt clamp I should have the center in a specific location, middle of everything or at the 0,0 point?
It looks like you will need to zero one side before the other, or else you won’t be anywhere near the limit switch. Is that correct?