05-04-2013, 05:24 PM
I've done this on a few Philcos. This happens to be an American Bosch. I attach metal hardware cloth (the kind with 1/4" squares) to the plywood first. This is on the grill cloth side. The grill cloth then goes on to the metal cloth. It keeps the grill cloth flat. There's no chance for a speaker "circle" to form. Only I know that it's there.
[Image: http://i191.photobucket.com/albums/z309/...44e489.jpg]
[Image: http://i191.photobucket.com/albums/z309/...44e489.jpg]