Bigmac
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The 101b an the sp125 have reverse thread pto and no keyway, but are not the same crank, the 797 and mc101/101a/101aa had standard thread/key way pto’s, all are of these are interchangeable otherwiseThe 101 cranks can be different. A 101b is pretty much like a 797 crank, if memory serves. The 101c has opposite direction threads on the PTO side, and the 101D has a large, non - tapered PTO side.