I have really good luck with a double clinch knot tied tight to the tow bar of the plug and I push it back on the top of the towbar towards the plug. It will hold pretty true for trolling straight.
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Join the Puget Sound Anglers Sno-King Chapter. Meets second Thursday of every month at the SCS Center, 220 Railroad Ave. Edmonds, WA 98020 at 6:30pm Two buildings south of the Edmonds Ferry on the beach.