cup

I am not sure if this is correct to call it an arm. Anyway, i am prepared a pic to show. please see the attached. now this part is so weak that, it moves up and down easily, and therefore leakage is easy. now i would love to be advised, is there any way to strengthen this part? this is a low C...

Anyone know possible causes or remedies for a cracked A key cup on a Selmer Mk VI alto 61xxx? I suspect a botched pad replacement job, but repair man denies all knowledge. Any ideas? :x