Selectric III Ribbon Conversion

IBM Selectric III models were equipped with two different types of ribbons - the 1299095 SRS style, also used in Selectric II models and the 210 CRC "Bicycle" style on machines built between February 1982 through October 1984 (that's the official dates anyway). It was nicknamed "bicycle" since the outline of the ribbon cartridge looks like a bicycle. The 210 style was designed supposedly to…