1. A WORK HOLDING FIXTURE FOR A SPHERICAL OBJECT WHICH COMPRISES A SUBSANTIALLY CYLINDRICAL OUTER BASE MEMBER ADAPTED FOR REST UPON A PRIMARY SUPPORTING SURFACE WITH ITS AXIS OF REVOLUTION PREPENDICULAR THERETO; A SUBSTANTIALLY CYLINDRICAL INNER MEMBER CONCENTRIC WITH SAID OUTER MEMBER AND HAVING A CONCAVE WORK SUPPORTING SURFACE COMPLEMENTARY TO THE OUTER SPHERICAL SURFACE OF SAID OBJECT AT THE UPPER TERMINUS OF ITS INNER SIDE; AND A PLURALITY OF BALLS RETAINED BETWEEN SAID INNER AND OUTER MEMBERS IN ROLLABLE RELATIONSHIP THEREBETWEEN, SAID INNER MEMBER BEING ROTATABLE AGAINST SAID BALLS AND RELATIVE TO SAID BASE MEMBER ABOUT SAID AXIS OF REVOLUTION.