Abstract: A pressurize air differential core winding apparatus comprises core mounting outer rings rotationally slidably mounted on a corresponding inner camming ring having outer camming surfaces. A rotating drive shaft has radial displaceable buttons which are displaced radially outwardly by an inner inflatable bladder to selectively rotate the inner ring forming a clutch mechanism. Each outer ring has an annular array of slots in which are elongated rotatable gripping cylindrical rollers having arcuate edges. Each roller is resiliently urged radially inwardly by an O-ring against the camming surfaces. The camming surfaces selectively urge the rollers outwardly to grip a core about which filaments are to be wound. An array of recesses in the outer ring receive a corresponding pad of fibrous members such as the hook type fasteners available as Velcro and Velcoin brands for initially frictionally engaging and gripping a received core.