Does anyone know if there is a parts bundle to convert a 9860 to a fixed speed feeder house? I know we did it on our 9750 but have never seen it on a 9860. We're having a lot of trouble with the upper sheave bearings and feel we'd have better luck with fixed speed if it's available. We don't use it on the corn header any more, just a flex head for soybeans, so we don't need variable speed anyway. TIA