[KLH 6 Need a Durable Material for Speaker Grills]

This is how the grills on my KLH 6 speakers looked when I bought them used.

The owner broke the grills when he removed them to show the speakers-

I tried 1/4 Masonite (friend cut holes out) they cracked in the same place when I carefully stretched new cloth on-

I reinforced the cracks with thin strips of aluminum and super glue-didn't work very well- 

Looking for recommendations on a more durable material for making new speaker grills-

They are worth it. New caps, wiring, batting and refinishing the cabs-oh, and the sound.

-

[KLH Model 6 Black Linen Cloth]

I'd like to know why these speaker's have a piece of black linen cloth inside the cabinet along with the fiberglass? 

As far as I can tell they are original-.

Tried to upload a pic too many MB-

Don't know what to do about that-

Thanks for you help-

Rob