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Real Steel trident for SCUBA self defense. Alpha And Omega Industries!
Has a set of small hydrofoils on the neck, which serve as extra parrying, trapping, and striking surfaces as well as possibly serving to help steer you mildly through the water. They are modeled on winged spears from Europe.
These are an experimental trident feature and it is unknown to me if they are helpful or hurtful to the user in water.
Plain and hydrodynamically neutral versions of this exact trident head are available in my shop. Trident 1 and Trident 3.
The same as an historical Viking spear, according to weapon construction laws in norway at the time, the spearhead is fitted perfectly to match the inner cone in the socket (a bit thicker on the pole than the inner cone for tightness), it is Jammed in tight, then drilled through and pinned with a single rivet, nail, or pin which goes all the way through the shaft.
The hole for this pin is 3/16 inch diameter, a commonly available size.
Do not use a screw. Screws will cut into the shaft and the head, it weakens the item. Use a 3/6 nail and then cut to length and hammer it over the end like a rivet. 3/16 inch rivets can be used. Beware corrosion and galvanism.