inner surface a spring retainer slot 82 is formed in the opposite lower surface of the member 79 and accepts an arcuate leaf spring 83 the spring 83 is retained in the slot 76 by the spring retainer areas 78 the spring 83 urges the size reducing member 79 into the shank finger opening the arms 80 and the space between the tabs 78 are sized to allow the arms 80 to pass the tabs 78 when the size reducing member 79 is inserted into the slot 7 the spring 83 also is inserted between the tabs 78 to assemble the unit if desired the area between the tabs 78 can be filled and polished fig1 shows another modification of the invention which is closely related to the forms of fig5 and 12 except that a different type of spring is used in the embodiment of fig1 two size reducing arms 30 are used the spring 85 is a combination form of leaf and coil spring it is a continuous spring and has arm engaging coils 86 at each end and a center coil 87 the end coils 86 urge the pivoted arms 30 into the finger area of the ring shank fig1 shows still another modification of the invention involving only a single size reducing arm which is pivoted at one end the arm 90 is designed to fit in a slot 91 in the lowermost portion of a ring shank 92 the arm 90 is pivoted at one end 93 to the ring shank 92 and the other free end 94 is retained in the slot 91 by a lip 95 a spring 96 is retained in the slot 91 by opposed spring retainers 97.