INDEX TO PARTS, FIGURE 19 Reference Number Functional Group 6703 6703 6703 6703 6703 6703 6703 6701 6701 6701 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 Item Reference  Functional N  a  m  e Number Group SCREW 22 SCREW 23 BEARING 24 HOUSING 25 PRISM 26 SCREW 27 MOUNT 28 SCREW 29 SCREW 30 SCREW 31 NUT 32 LENS 33 SCREW 34 PLATE 35 SETSCREW 36 PRISM HOUSING 38 SCREW 39 S C R E W 40 PRISM PRISM 42 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 6703 Item Name MOUNT SCREW MOUNT KNOB COVER WHEEL WASHER SPRING SCREW HOUSING AXLE CIRCLE PPISM ARM SETSCREW ARM SCREW SCREW PIN SCREW MICROMETER  AY 37 41 92