I'm very familiar with the concept of smooth plastic backing on adhesive. I've rummaged about it in many different places and there has never been a split. He always wanted to completely free himself from the felt. The adhesive appears to be fully bonded to the substrate. A trick I use sometimes is to take some tape and apply it to the edge of the backing to separate, and even that never showed the slightest bit of separation. So I couldn't try to install.
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