Mounting pistons to the Scat 4340 H-Beam rods (PN 245463852200) can be an exercise in futility, if you've never messed with Spiro-Locs. These spring-steel babies are difficult to work with, but do provide a positive way to lock the pistons to the pins. As shown in the photo, Spiro-Locs have to be spread apart and worked into a receiver groove, bit by bit. Charlie used Clevite assembly lube (or "red grease") on the pins, to help ensure that the floater pin doesn't seize. Note: Installing them is much easier than removing them!