Are you talking about the shaft, or the actual locks? Locks loosen and need periodic tightening. DON'T use a rock, unless you take the whole thing off your boat, set on a hard surface and bound the "wings" together. If you just hammer them on your boat, you can bend the shaft (how I think I bent my shaft), and then it doesn't want to spin freely. I'm awfully leery to try to bend the shaft back, fortunately I have another idea.
I am a river, babe - I've got plenty of time, I don't know where I'm going, I'm just following the lines..... - "We are water" by Shaye