I just received my kayfun lite in the mail today, and i had noticed there is a stationary air hole and another airhole which is threaded but doesnt have a screw for it, so i emailed the place that i bought it from and they are telling me it doesnt require a screw because its a kayfun lite Not and ES, i just think it does or if not the draw would be to airy IMO, Is there supposed to be a screw in the side?