I always kind-of thought of a bobber to be something so easy to improvise (piece of wood, etc) that I never really considered putting a bobber in the kit. However, the earplugs are the best idea I have ever heard as far as man-made bobbers go. I'm going to give them a try this weekend and see how they would with 1/16 and 1/32 weights.
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Learn to improvise everything.