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They work well , I have those screw on bells / glow ,I got them at Wal-mart very cheap. they have springs and each has 2 bells attached.
kirkwooders - great idea, think I'll give it a try. What did you use to attach to the flag? Was the weight of the bells a factor? Details, please...
I haven't tried them on my old stand up tip ups yet, because I don't think that the springs that the flags are on would be strong enough, but I'll give them a try too and let you know.Dave