Check to be sure both knotters have the same degree of tension in the springs. Use the "good" side as your reference point. From what I remember of our 532 you can unbolt one bolt and the knotter will pivot on the main cam shaft. This will allow you to look underneath and check for any blockages or grass caught in the knotter. Also how tight are you making your bales? if the hay is too damp or you have the bale chamber tension set too high it will not tie properly. I know our baler probably baled over 120,000 bales during the many years we had it, but we periodically would have to spend a bit of time making sure the knotters were adjusted identically. Putting a but of diesel fuel may not be as far fetched as it sounds, especially if the baler has not been used for some time. Do you have the manual to your baler? That gives many good suggestions and settings. The polyexcel chart is also excellent. And for what it is worth, our 532 would never tie the plastic or poly twine at all. It was too slick. We always just used the sisal twine. Good Luck. W. Jones