I need to break down and make we some of the old ones i used to use on Barkley in the 80's. I used just a regular bottle cork with an insert from an ink pen ran through it for the line to go through. Had some different sizes for different weights. They were great on windy days as they floated right on top with no tilt due to the wind. Just paint the very top flourescent and be done. i guess I am just lazy now and buy all mine. Balsa slip bobbers is my choice.