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Here we see the shim between the axle and the monoleaf with the thicker side to the rear. The POL monoleafs came with new U-bolts, which were used to tighten the assembly back down. We now have about 4 degrees of caster. There is a simple machined pin and a nut that mount the rear of the front monoleafs to their brackets on the frame; don't forget the grease during assembly and to use the grease gun on all the zerks afterward.