I believe my 48” has the same smaller pulley on the right spindle. I think it was designed that way so the right blade spins faster to throw the clippings out and to help that blade cut better since it has to deal with the extra clippings from the other two blades.
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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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