http://www.bomberonline.com/store/image ... top_lg.jpg
You mean Part #1 ? This seems to be a regular screw with european 8mm thread and cone.
Something like this is available at our HORNBACH BAUMARKT in Wiesbaden, even in stainless, damit´s nicht rostet.
Man sollte nur eine gute Schraubenqualtät nehmen damit der Imbus nicht gleich ausleiert.
Altrenativ: in every major city there are special dealers for Normparts, the place where Handwerker go shopping.
Price: 5$ for 4 screws is not that bad, I would think 50cent each is german price.
I will try to get the new RAB from bomber in Dez.. I have friends from the US coming to my place and bring it on 15th Dec.. If Bomber has it shipped at that time. So I could add a set of screws too.