[codefox1]

Well, if you can guide the grille cloth down little by little by pulling on it and sticking pins in in the cardboard until it lines up. Use those little binder clips you took from the office to "remember" your advancement. Once you have it all straigened you you can glue down the farthest edges of the grille cloth one segment at a time to the cardboard, one segment at a time. Takes days, but it works. If you need to firm up he ends of the cloth, bond them first with a little bit of "Elmer's" after correting the weave as best you can. It is an iterative process and is quite reversable with water. Always know where the visible regions of the grille cloth are (they will be darker,) and other than that you can't get into too much trouble.