Good day together, I usually have a lot to do with BMW and have to do with the VAG group rather less. Now I have a seat in the family and wanted to change the cuff from the brake caliper piston because it is leaking. Can someone please explain to me how to get the cuff on the brake caliper? I have already broken two cuffs and unfortunately can’t get any further. There is no groove or similar where the cuff can be mounted. I know that so well. How do you put this metal ring on it? I’m grateful for any help!