Tension bolt help.

I have not been able to determine which tension bolts A, B, and C in the middle section assembly instructions. Any feedback on what I missed or which bolts are which would be great.

Tension bolts have plastic on both sides, non-tension bolts have plastic on one side and just a bearing and nut on the other.

In the assembly instructions they are label in bold, just start at the top and work your way down.