The 24" or 36" lever arm handle is supplied partially pre-assembled. We assemble the clevis, the two brass shims, and the clevis pin to the lever arm.
Separately, the mating mechanismthe lever bracket, the lever link arm and the clevis pin plus shimsare combined into the Lever Link Arm Bracket Assembly.
Put these together before attaching them to the pump head.
Put them on a flat surface. Introduce the first shim between then two mating parts (right).