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OEM mandrel (Detail #11) used in the R-1000 internal Roll-a-Finish burnishing tool assembly. Fits the R-series tool covering ~1.000 in nominal bore size within the R-1000 to R-1594 (1.00–1.625 in) range. Pairs with the R-1000 sleeve (D12), R-1000 cage (D13), and R-875 roll set (D14, qty 7). Use as a direct replacement to restore factory performance.
