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The JE Pistons Spiro Lock is a carbon steel wrist pin retainer supplied individually; this listing references a 0.990" pin diameter and 0.042" lock thickness. JE explains that spiro locks are installed by spreading and rotating into the pin boss, providing secure pin retention. The market notes differences between wire, hook wire and tru-arc styles for varied installation ease and reuse characteristics.
JE Pistons Spiro Lock
