Spearfishing tip idea for 7mm-7.5mm shaft it's been on my mind if

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Spearfishing tip idea for 7mm-7.5mm shaft it's been on my mind if this is possible and worth while? : r/Spearfishing

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House of Scuba 6mm and 7mm Speargun Shaft Adapter for Spear Gun Shafts/Tips, 6mm Shaft to 7mm Shaft : Ice Fishing Spearing Equipment : Sports & Outdoors