Just wonder if anyone could help me with some information,,I have just got a Ludwig Black Magic 13"x7" Snare Drum,And i have noticed that the bottom hoop when placed on a flat surface it touches where the snare holes are but 90deg to each side the rim is raised by 2mm to 3mm,i complained to the shop i got this from but i was told Diecast Hoop are bent,I have had no experience with Diecast Hoop before,could some explain what is correct ?,Thank you