I believe ED L has a valid point, an old plumber I knew used a similar tactic when soldering Y shaped copper pipe. He would cut his pipe angles and use a sooty flame from a blow lamp to black the inside of the pipes. He would then solder the outside and any excess solder on the inside dropped away when he tapped the completed joint.

Well, curiosity got the best of me, and I decided to try the soot from a candle to help prevent the solder from sticking, and to try dumping the molten solder into the mold instead of using the mold to melt the solder.

I used the candle to blacken the mold, you have to stick the mold into the candle flame to get the soot on it.  I then made a hole in a small piece of aluminum and threaded in a long screw as a handle to melt the solder in.  I also tinned the end of the cable before placing it in the mold.


I then heated up the mold, and then switched the torch to the aluminum cup and melted the solder.  You evidently can't pour molten solder slowly, and when I tipped the cup the solder just flew out in a molten lump.  I scraped the excess off quickly with a piece of wood.  I let it cool a few minutes until the shine was gone from the surface of the solder and it didn't move when I poked it.


I then took the mod apart, and the first half came right off!


With a little filing to get rid of the cone at the bottom.....it looks great!


If you are only making 1 or 2 cables and you have a lathe, it is faster to just make a brass fitting and solder it on.  If you were making a bunch of cables, have a drill press and a hacksaw - it is probably worth making a mold.

I think that's worth a tech section post.