Well my "friends" have always advised me to use a 7lb lump hammer. I have to confess that this year I threw away my 20-year old Xmas cracker plastic kazoo as the membrane was punctured and invested in a batch of metal ones (one of which I gave away in Greece).
I know I should have sent the old one for recycling or auctioned it on E-Bay. I'm sorry and will do penance ( 3 choruses of "Sweet Sue").
RtS(still scrapin' and a-hummin')