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Provides no pressure on the mandrel thus eliminating any bending and vibration Adapts to almost every mandrel with a shaft diameter of .245 inch (6.22mm) or smaller; mostly commonly used with 7mm mandrels Used in tailstocks to secure pen blanks on the mandrel Eliminates damaged mandrels and out-of-round pen blanks by putting pressure directly on the pen bushing, not the mandrel There is no longer a need for spacer bushings