Went a little outside the box today. I did not just want swappable heads but I wanted to be able to move and tilt the head as well. I sank a magnet into the neck, then instead of mounting one to the Super structure I let it remain lose. I found that a Testors dull coat cap fits PERFECT. Dropped sons CA glue around the edges. When I remove the head the magnet falls into the cup. When I place the head back the magnets pull back together.
