GSSDO6, Photo # 1. Here is the jig I made to drill all the holes in the conveyor belting. The only thing I did that made everything simple and mistake free is this. See the three rows of six holes, After I drilled all nine holes in the belt I would only advance the jig two rows, I would overlap the third row with the previously drilled holes and pin the jig to the belting by tapping two bolts through the jig into the belting. That way you always reference the jig two your prior drilled holes and then all errors are eliminated from then on as long as your jig is right.
Photo # 2. I made several attempts before I got the holes for the jig centered and spaced right. The method that helped me drill dead center to build my jig was tac welding the correct size washer in exactly the right place onto my jig steel. The washers acted as a guide to keep my bit from wandering as I drilled into the jig steel.
Photo # 3. The rubber bit I bought at home depot, I think it was called a centering bit. But it worked great at cutting the belting through the jig. All the holes in everything were drilled 5/16, No oversized holes. Hardware was all 5/16 grade 8. Everything fit snug. Hope this helps.
Im surprised not many people responded to my track tension question. Everyone with one of these rigs must have some kind of opinion on the subject