Proform 67657 Professional Piston Ring Friction Pull Measurement Tool
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Minimizing piston ring friction before blow by is one of the best ways to maximize engine efficiency. This tool accurately measures the pull of a ring in the bore for a quantitative measurement of friction as a function of gap and diameter. Get it right and get the trophy! Includes two expandable platforms for pulling, and a precision digital gauge for accurate readings. U.S. Pat. 8.479.570