Why are the two bends not in the same place on the right and left main tube ?
Make an incision in the inner wall of the right 40x10 tube, 17.2 cm from the FWaP. Make a second incision 10 cm from the FWaP in the left tube. Remove the fixing rod. Bend both ends inwards until there is only 8 mm space left between the tire and the tubes. Tack weld both ends together. Connect the two ends with two triangular 1.5 mm thick plates and one rectangular sized plate. Leave 2 cm of space between the plate and the tire.