That's pretty slick. I hadn't thought of melting the nylon around the head.

I've made needles for such uses by tightly folding a foot length of copper or music wire and using one of several methods to hold the two fee ends together to form a rough point.

The best I've bade were made of stiff music wire, available at a hobby shop and used for models, that I lightly brazed the free end together and left about an inch unbrazed where the bend was made. This bent end I spread a bit after it cooled to form a head on the needle and I worked the pointy end with files and a Dremel tool to form the point I wanted.

I've done the same thing with copper wire and solder. A bend of wire might also brazed or soldered into the thin brass tubing available at any good hobby shop and some hardware stores. Eighth-inch copper tubing used in refrigeration work might be employed. I've never used it but suspect that with the wire welded into position for a head to gold the line and the other end of the tube sealed shut and formed to make a point such an assembly might make a functional item.

If your handy with a Dremel tool, wear those safety glasses, you might experiment with a slightly larger nail and using an abrasive cut-off wheel to cut a slot opposite the pointy end. A sixteen penny nail might work but I would start with something like a 20d spike.

Threading paracord into these 'needles' is easier if you milk the core threads out and cut them off so six inches or so is a bit thinner and flexible. Run through the head of your needle the cord will tend to lock in the tight bend of the wire but if your going to be pulling hard a few stitches with a regular needle and thread holds the free end so there no risk the cord will pull back through the eye on your new paracord needle.

More recently I've been told that there might be suitable huge needles available at any good sewing shop but the need was long gone by the time the news got to me. And somewhere around here are a couple of nice ones I've made.