Have been messing with this Ford 515 three point sickle mower for a couple years. No matter what I try I can't seem to get the breakaway arm to hold as it should. It will release just driving across the yard with the mower down. I've adjusted the length three bolts holding the main the spring and it doesn't seem to help any. I can grab the end of the sickle bar, pull with one arm and get the breakaway arm to release. Can't see any obvious issues in the latch as I currently have it apart. Anyone out there have one of these and any advice?