I am as much a metallurgist as I am a unicorn that farts rainbows... that being said...
There is definitely some trait the bronze has that creates special problems with knurling.
Henry and I spent a good long time discussing knurling on Monday, and what we might do in the future. Probably keep the standard knurling we have on the lights, but may offer different knurling in the future on some special runs. We are still discussing it.
As for the bronze, we won't be making any more of those ever again. So, the 21 that were sold... plus Henry's and mine, are the only ones that will ever exist. Henry and I still don't even have ours yet... too busy pushing the others out right now.