My trailer hitch will not open the Jaw when pulling the lever up. I have the drum style brake hitch.When lifting the lever, it will allow the jaw to open, when jacking the trailer off the ball. But when I want to load the trailer to the ballI have to maually hold the jaw open with my finger to allow it to go down over the ball. Not cool.Does anyone know how the hitch works on these type of trailers? The hydraulic brakes were disabled on this trailer by a pervious owner.The lever normaly opens the jaw, but as of late, it has quit working???Any ideas?Thanks