Kottke used what is called a tip-up, an ice fishing devise that

Northern Minnesota inventor hopes ice fishing rod holders catch on – Twin Cities

Ice Fishing Methods for Trophy Walleyes - In-Fisherman

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BITING Flies dead zone , puzzle - webapps8 - Minnesota

How to Set, Bait, and Use a Tip-Up for Ice Fishing

Tip-Ups, Setlines & More - In-Fisherman

Fishin' with Dave

Fishin' with Dave

Heritage 36 Laker Standard Tip-Up