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21 The JE pistons utilize wire locks to hold the floating wristpins in place. Wire locks do an excellent job once they are in place, but they can be difficult to install and seem to have a tendency to spring out when they are about halfway in the hole and roll underneath your toolbox. I prefer to use a device called the Lock-In-Tool which makes installing wire locks a snap. It holds the wire lock in place so it can't spring out on your while you push it into the groove inside the piston's pin towers.