I have a 3 foot moldboard spring trip , I think it is a Ford although it is red not blue, that I plow with for gardens and deer plots. What kinda maintence do I need to do to it. I tripped it on several stumps today and notice that the rear plow is harder to reset than the front. I have to sit it down and back onto a log fpr the rear but the front plow I can reste by kicking it. I think due to some rust on the mechansim that holds it in the locked position. Does anyone have a site with the owners manual on it or advice?