Quick background, I have used this 580 Super K on the family farm for years. I like to think that I am proficient on this piece of equipment. Have also helped with maintenance on it. Ok, my father in law passes away a year ago. The swivel seat has always moved without any mechanism for years. Now it is locked in forward position. Have looked several times to locate problem. Thought I would find out how simple the fix was on here before I tear into this seat. Little things will always kick your tail.