I made inexpensive releases using mini spring clamps. I get the clamps from Kroger Marketplace for $.59 each and they even have holes in the handle to attach to a shower curtain ring. I half lap a number 16 rubber band over the fishing line, cut it, and attach the clamp to ONE of the tag ends. The clamps hold on a little too tight with both tag ends attached. With only one tag end attached, a larger fish will release it and the rubber band will stretch more than the others when dragging a white bass/perch. Here are some pics...

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