I bought the humminbird ice bag for my Humminbird 597 for ice fishing. I wanted to attach an ice transducer arm for my transducer because I don’t like using the float. I bought a transducer arm from Marcum and I am having trouble finding what size bolt is needed to fit where it gets mounted on the Humminbird bag. Has anyone used the Humminbird Ice bag to attach a transducer arm and if so what size bolt fits where it gets mounted? Thanks

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