Getting ready to get my speakers up and running and was wondering how they are mounted on the various cabinets. The plastic lenses look like it's just a velcro strip. Which would work just fine. I will be using the H94 serpentines and was wondering how the metal lenses were done?? They are heavy and I don't trust velcro to hold them. They have threaded holes on the back spacers and was wondering what was used to attach them to the cabinet. If I remember right I have seen metal bars that were screwed on. If this is correct how thick are they and how high off the horn does it space the lense????