Drill string stabilizer

Claim 1

A DRILL STRING STABILIZER COMPRISING: A DRILL COLLAR HAVING A CYLINDRICAL EXTERIOR SURFACE; A CYLINDRICAL BUSHING ROTATABLY POSITIONED UPON THE CYLINDRICAL SURFACE OF SAID DRILL COLLAR; A FIRST SHOULDER DEFINING MEANS REMOVABLY AFFIXED TO SAID CYLINDRICAL SURFACE TO LIMIT THE LONGITUDINAL TRAVEL OF SAID BUSHING IN ONE DIRECTION; A SECOND SHOULDER DEFINING MEANS REMOVABLY AFFIXED TO SAID CYLINDRICAL SURFACE TO LIMIT THE LONGITUDINAL TRAVEL OF SAID BUSHING IN THE OPPOSITE DIRECTION, SAID SHOULDER DEFINING MEANS INCLUDING A SLEEVE WITH A MALE TAPERED PORTION HAVING AN INSIDE SURFACE IN ENGAGEMENT WITH THE OUTER SURFACE OF SAID DRILL COLLAR, A SOCKET HAVING A FEMALE TAPERED PORTION ENGAGING SAID MALE TAPERED PORTION OF SAID SLEEVE, SAID SOCKET AND SLEEVE HAVING THREADED CONNECTIONS WHEREBY LONGITUDINAL MOVEMENT OF SAID SOCKET IN ONE DIRECTION CAUSES GREATER INWARD GRIPPING FORCE BY SAID MALE TAPERED PORTION AND LONGITUDINAL MOVEMENT OF SAID SOCKET IN THE OPPOSITE DIRECTION CAUSES A RELEASE OF THE MALE TAPERED PORTION TO PERMIT REMOVAL OF SAID SLEEVE.