The rollers on the trunnions, are they supposed to roll or not? I had 1 loose and 3 tight. I thought the bolts would have had a shoulder on them but they dont. You can tighten the bolts untill the rollers do not turn. Even by leaving them a bit loose they run on the threads of the bolt and would be a bit sloppy. There are flat spots on the rollers and the bars they run against. The bars i can flip to the good side. I need to know if the rollers are supposed to roll or do you tighten them down with the bolt. This setup doesnt make sense to me.