I bought a set of Remo rings to really muffle my drums down for low volume gigs. The 13” ring won’t lay flat however. It was flat a first, but at the first gig I used it, I took it off at the end when things got a little louder and now it tries to twist into a figure 8. I tried to lay it on a flat surface and use a hair dryer to heat it up. That didn’t work. Any suggestions? I would just by another one but the 13s don’t come by themselves. I would have to buy a whole new pack.