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I use book matches. I first make a loop where I want my line marked. Then I reach through the loop and grab the two hanging ends of line and pull them through the loop far enough to slide a match in and pull it tight. They easily come out, and the match can be reused. If you can't picture what I'm talking about, let me know and I'll post a picture.
my great grandfather & father both used buttons.....so in my world, this is the only right answer! i also hook a rubber band on the trip-hook of my trap.....at the end of the day, when i reel up, the hook gets hooked under the rubber band.....with tension, it keeps everything neat and tangle free without having to hook back into the line or under a wingnut
bobbers are the easiest 8)