How big of a hilt are we talking for the 10W with 4x 18650s (which I forgot existed until mentioned here)? 14 inches? 16 inches? 20 inches? Because I had intended to try out one of those 10W UVs (yes, I'd buy all 73 (for $85, it isn't too bad), keep some for spares, sell off the rest) on a 14" hilt with no sound in the near future.

As far as heatsinks, I assume we would need a large block of metal (copper ideally, aluminum alternatively) inside to absorb it, right? I don't intend to have the saber on for more than maybe ten minutes at a time.