Hi, anyone in the UK knows any good leather supplier or website where I can find the right leather for concertina valves? I bought a sheep hide from ebay to cut and replace the valves myself, but they curl up too easily. I trimmed them to the same size and chose the same thickness as the original ones, but they tend to curl rapidly just with gravity. I’m guessing it’s a matter of stiffness and flexibility? It’s the first time I’m cutting them myself, if anyone has found the right leather I’d appreciate a bit of help. Thanks.