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Wow, you're the man. . . clipping a loaded speargun to your BC and ignoring it on a dive. Sorry, I can't tell you what the size of your threaded shaft is, but there are thread adapters made to change points from one brand to another. My favorite points are made by JBL, they offer a rock point with spinner barbs, that will hold if the fish spins around. The rock point is round like a pencil sharpened piece of steel. It is tougher if you go through the fish and hit rock. The also make a Tri cut point, that has a sharp edged pyramid of a point, also with spinner barbs.
Both of these points have smaller length barbs, that will open on the back side of the fish if your spear doesn't penetrate deeply through the fish. Some well equiped dive shops will carry points and adapters, or you might have to shop the internet. To determine the thread size, take the shaft off of the gun, so it is just a non-threatening steel shaft, go to Lowes or Home Depot and test different nuts till you find the size and thread count. Back when Nemrod sold a small gun, it lacked penetration. . . switching to a longer shaft in the same gun, increased the mass of the spear and increased accuracy and penetration.
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