"Jiggly Pump Arm" ? I KNOW WHAT YOU MEAN

"Jiggly pump arm" is likely not a good description of the problem. I would bet that the pump arm itself is firmly secure to the lever assemble, but that the lever assembly is what has unwanted side to side movement that makes you call it "jiggly". If that is the case, maybe we can improve that situation.

The way to correct that is to place the right number of the right size washers between the two halves of the lever's "knee" (where either the banned-in-our-shop OEM roll pin may still be in use... or maybe you have already upgraded to the stainless hardened roll pin replacer we make).

If you make it too tight (too thick of washer(s), then you will cause friction and wear. If too loose then you have wasted your time. So just "barely or almost snug" is the Goldilocks equivalent of "just right" in this case.

The washer would have to have an inside hole diameter such that it would slide onto the 3/16" roll pin replacer... then the outside diameter could be in the 3/8" range.