There is no tolerance between row 0 and the OHP and tracker frame. When one edge of the row is roughly in contact with the top of the OHP (with room for mounting bars) the other edge rubs against the tracker frame and catches on the OHP on the other side.

When integrating we removed one mounting bar to make more room, this caused the modules to move w.r.t. one another.
As we moved in the cooling collar holes would routinely catch on the OHP requiring constant management of the modules and OHP tubes and slight bending.
There is no tolerance between row 0 and the OHP and tracker frame. When one edge of the row is roughly in contact with the top of the OHP (with room for mounting bars) the other edge rubs against the tracker frame and catches on the OHP on the other side.
When integrating we removed one mounting bar to make more room, this caused the modules to move w.r.t. one another.
As we moved in the cooling collar holes would routinely catch on the OHP requiring constant management of the modules and OHP tubes and slight bending.