I just bought a used 16, and I can't get my rudders to lock down. I think the problem is that the cams are locked down without the rudders in place. The cam is turned all the way back and doesn't seem to want to move in either direction. I have tried pulling it up a little to get it to pop out, but this doesn't seem to work, and I don't want to apply too much pressure and break something. Does anyone know how to get the cams into the correct position without unscrewing the adjustment at the bottom and taking the spring out?