We’re just about to make a 61-piece Isabella TÜV-ready. Of course, the wheel brake cylinders are also overhauled. Now we noticed at the disassembly that a cylinder unfortunately has such a plastic part broken, which ultimately also resulted in the cylinder not working clean, because the one pot cuff (probably) bent and thus passed away. The cuff is referred to on the first picture with 9. The part that I’m looking for is sitting directly below. f the stop spring 8 and is unfortunately not present with the overtaking kits. My question is now, what the thing is called, so that I can possibly use replacement from another vehicle. It would also be nice to know what the part does (except to form the support surface for the pot cuff, that is clear), because I think that the hole in the middle is not without reason in it. Images are attached. Would be great, if possibly who could help me. Thanks already!