The R does stand for revision. The 70 and 100 had the solid pin with no grease zerk. Most guys find that the pin is seized into the axle. Mine took heat and a 20 ton press to remove as well.
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Adam
1964 Model 100 w/ K301 12hp and custom hydraulics
1972 Model 149 turned 129 w/ K301 12hp, triple hydraulics, 66 series clone
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