Ring holding fixture and accessory system

A ring holder system comprising:

• a ring holder base comprising a main body with a top, a bottom, front and rear end faces, and sides with upper angled mounting surfaces;
• a rotatable collet-holding mandrel extending from the front end face of the base, the mandrel mounted in the base on a mandrel shaft extending from the front end face through the main body toward but not beyond the rear end face to be manually rotated by a knob or handle removably connected to the shaft at the rear end face;
• a horizontal tool adapter comprising a stepped cantilever beam configured to be secured to one of the angled mounting faces with a free end extending forwardly beyond the front end face of the base to a location above the mandrel, the one of the angled mounting faces comprising a mounting feature for the horizontal tool adapter;
• the rear end face being substantially flat so that the rear end face may rest on a surface in a vertical work orientation with the mandrel-rotating handle removed from the mandrel shaft in the base;
• and,
• an L-shaped vertical tool adapter configured to be secured to the bottom of the base when the base is in the vertical work orientation with a tool mounting arm extending horizontally parallel to the front end face over the mandrel, the bottom of the base including a tool-mounting feature for mounting the vertical tool adapter thereon when the base is in the vertical work orientation.