Hi Bob, the fist thing I did was put lubricant on it to make it slide better. It did not make much of a difference. The directions actually have a diagram showing which way put force on part of the lower arm to make it easier to operate. I suspect the the part that is attached to the trailer is not far enough apart, making the arm that slides bind. The other arm works fine and adjust easily. I,ll have them fix it under warranty and go from there.