[frank000]

Maybe this will be of some assistance:
Don’t Press Me - Letterpress Studio, Invitations, Stationary, Letterhead, Business Cards » Making Photopolymer Plates

Or, if you want to pay someone else,
Boxcar Press: letterpress printing, letterpress pre-press and photopolymer processing, and digital letterpress printing supplies for the 21st century. Home of the Boxcar Base and one awesome letterpress print shop.