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Ron at Pioneer Game Calls is the man. I go through two reeds per year per call, though? Tell him tune it right once and quit pulling on it all the time.
I always used no lube Trojan condoms, just cut them up into pieces for my snuff cans. That have lot's of uses.
I use thereband yellow & red
I ordered Tan and Yellow Thera band form Amazon. Works Great
I have successfully used balloons on my tubes. Different brands can be thicker or thinner. They are cheap and available anywhere. Drawbacks are they can be a little tough to cut to size, as they are an odd shape, but they seem easier to tune to me and keep a tune better. Might give it a try and see if they will work for you.