Ahh, I got what you were meaning now.

A harpoon tip or spearhead should not be very hard to make; take a piece of steel, cut, file or grind it to shape, drill a few mounting holes in it and sharpen an edge on it. If you do not have a piece of steel then just fatten a large nail with a hammer and go from there.

Because fish in my location spawn in shallow rocky areas this harpoon/spearhead is going to be damaged quite quickly. I could not see myself spending a lot of money on a harpoon/spearhead because I know it is a tool I would abuse and proably break or loose then have to replace.

I have no experience with saltwater situations but I would think that a harpoon head would last a lot longer there because there would be less contact with the rocky bottom; therefore it may be worth getting one of better quality (could also double as a back-up knife).