I also shoot a Rottweil Olympia 72 w/ Tula chokes. I used to shoot International Skeet back in the day, when tournaments were widely held and I was a bit younger. I have a supply of some parts, firing pins, springs, etc., but not what you are looking for. I once tried to get in touch with Renato Gamba via email, but never got a response.
I believe the entire US inventory of Rottweil 72 parts (Rottweil used to be based here in NJ, as a subsidiary of Germany's Dynamit-Nobel)was acquired by a gunsmith named Pyzanski, trading as Pyzanski Arms, based in either Va. or W. Va. If this is not enough info for you, get back to me and I am sure I can dig out at least a 'phone number.
