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"Thanks"..... guys for the info. My concern was that the "thread knot thingy" would obsorb water and freeze to the line on the spool. I'll just have to give it a try. Maybe a small rubber band knot would do the trick. Whatever...."Bring-on-the-ice.
Just a suggestion but instead of the knot, just mark your line with a felt tip marker at the depth you catch the fish at.
I have used those "knot thingys" for the exact use you are discribing, and they work well....Now start saving your money for a flasher!