With much respect, the foundation of understanding of this repair is faulty. THE scoop: The shaft is supposed to be loose between the drive and driven couplings. The only thing holding it in place should be the cotters. The couplings cannot be left loose, they will tighten up as soon as the tractor is operated. The threads on the couplers (you call them round nuts) are right hand thread on both drive and driven. The shaft turns in the direction of tightening them into the trans and into the pump. No choice. Leave it as is, it is now correct, and both drive and driven are tight into their threads. Jim
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