B) Negatives: More expensive than DIY and should include scheduling delays based on the availability of the assistance vendors. Hi there! To install the 39-310 clip, you must slip it on to the underside/within the glass louver. Both equally finishes within the clip have an angle bent in opposite Instructions; https://weballdirectorys.com/listings554200/the-ultimate-guide-to-how-to-install-securit-glass