this outer cloth 16 is tightly wrapped and sewen about this frame 14 the thickness of the outer cloth 16 is sufficient to allow the surgeon to pass a suture therethrough as seen in fig2 through 5 the ring prosthesis 10 is mounted about the lower portion of the holder assembly 12 this portion of the holder assembly 12 is the ring mount assembly 18 ring mount assembly 18 includes a ring support 20 this ring support 20 is generally annular with a shape similar to that of the annulus of the valve to which the ring prosthesis 10 is being sutured more particularly ring support 20 has a c shaped portion 28 with its ends connected by a straight side 30 the ring prosthesis 10 is fitted about the curved c shaped portion 28 of the ring support 20 the ring support 20 is formed with a groove or trough 32 which is dimensioned to receive a portion of the ring prosthesis 10 as best seen in fig4 the positioning of the ring prosthesis 10 within the trough 32 slightly deforms the ring prosthesis 10 this deformation places a thicker portion of the woven cloth 16 outside of the trough 32 to allow.