The felt I used came in a kit with the window channels, It was already formed.
I just transferred the original hole from the stainless to the felt. I used an adhesive and placed the staples in.
I’ve read of some members using a small sheet metal screw to screw them on and not using the staples.
use a sharp bit if you have to drill into the stainless, or drive your screw into an existing staple hole.
I saw a pic from a member who did this. The screw head was driven below the felt and had no chance of scratching the glass
Luckily my felt was formed already, Maybe a member who formed them will give you some tips on that.
Denny Grahams web site has some very good pics. Maybe you can take a look and get some ideas
http://www.pbase.com/dennygraham/doors&page=2http://www.pbase.com/dennygraham/doors&page=3His is one of the best sites for AD pictures and info
Good Luck