LEVERS Threads per Inch Sliding Feed in Inches – Surfacing Half Sliding D B 112 104 96 92 88 80 76 72 64 .0017 .0018 .0019 .002 .0022 .0024 .0025 .0027 .003 C B 56 52 48 46 44 40 38 36 32 .0033 .0035 .0038 .004 .0043 .0047 .005 .0053 .006 D A 28 26 24 23 22 20 19 18 16 When Using 36 Driver Gear .0065 .007 .0075 .008 .0085 .0095 .010 .0105 .012 C A 14 13 12 11½ 11 10 9 ½ 9 8 .013 .014 .015 .016 .017 .019 .020 .021 .024 C A 7 6 ½ 6 5 ¾ 5 ½ 5 4 ¾ 4 ½ 4 .027 .029 .031 .032 .035 .038 .040 .042 .048 Fill with Shell Tellus Oil 33 to Mark on Sight Glass Oil obtainable from Shell Oil Companies throughout the World