Today I made duplicates of the right side arms for use on the left side.

Once the arms were fabricated, I match drilled the pivot hole at the aft end of the arms to match the weldment. I should have gotten additional pictures, because I also fitted the UHMW blocks on either side of this arm. The thicknesses of these blocks were pretty close to the other side (within 0.010), so I feel pretty good that the frame is well centered.