Thanks for the advice. Later today I'll go out to the lake and check for screws and a knob below the window, although I do not remember anything there. I'll let you all know what I find.
You can also buy new string if the string is broken and restring it yourself. I did one on the Jayco in the five years we owned it and I have already done three on the Cruiser in the one year we have owned it. I sense a quality issue here!