So I just got this drum while digging through the old highschool band room. It's the kind of drum that rests on your knee and has a strap to March with. So I put in some heads I got from a drum shop and the bottom head looks out of center. Like when I look at it I can see down the side of the drum on what side through the clear head and I can't see down the other. It's almost touching. I don't know what to do. Help plz