Our new to us Newmar 4018's front Girard awning is not closing all the way. It should travel another inch and a half to match the rear. I have read for two days all other posts and the manual and understand how to turn the set screws with a 5/16th alan wrench but the screw doesn't change anything. Not even a thirty second of an inch. Has anyone else encountered this problem. Thanks in advance for any help. We are a bit overwhelmed with all the information and it looks like this will take much time.