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The first step when installing the rings is to install the spiro lox so the rods can be hung. The spiro lox keeps the wristpin from being squeezed out either side of the piston. Depending on the depth of the groove, the piston may take one or two spiro lox. Our set had a deep groove and required two lox per side. At times, a small flat-head screwdriver can be used to precisely locate the lox into the groove.