I have a JD 535 round baler. I took on some neighbors meadows this year to hay. I decided to go though the baler. New belts, lower drive belt, bearings, etc. Thought all was well but now i can not get the baler to make a 6' diameter bale each time. I have the diameter knob set at 6. I've redone the assembly on the twine unit. My thought now is to replace the microswitches. Suggestions?