RE: DIAPHRAGM CALL!!
Yep ... just like fingerz24 said , throw that one in the trash and buy a new one in fact buy more than one, buy diffrent ones.
Some are small and some have little domes, others may come in a three pack.
In my opinion ... it doesn't really matter what brand name you buy, they all make some good products.
I get some good sounds from the Quaker Boy and Primos brands but I also use some from H.S.Strut.
The point I'm trying to get across here is find something that works good for you and don't blow out too hard.