[RodB]

Aha, technique! I've found that the material makes the difference. First, the center of the baffle board is not always the center of the grille and with your pattern you'll need to know where the center runs top to bottom. You have to mount the board without the grille cloth and mark the board from the front so you can locate where the center of the grille is. Then remove the board and mark the top and bottom edges and use the marks to center the cloth on the board. Some use adhesive over the entire board and some use just an inch around the edge. I find it easier to make adjustments with the inch around the edge. I use 3M Scotch 77 spray glue. Depending on the material, dampen the cloth with a water spray then apply it to the board top to bottom keeping it taught. Make adjustments by pulling slightly. When the cloth dries it should tighten.