A friend who's a prototype engineer is getting me some Waterhouse stops laser cut, they will be stainless steel rather than brass, but will be gun-metalled black by a specialist company on the edge of the UK's Black Country (named after a 30ft coal seam).
I don't know the exact cost yet, but they will not be expensive, for example I can get a De Vere 504/507/5108 lens board made for less than $15 and that's a lot more metal . . . .
Anyone interested PM me. I will update with costs in about 3 weeks, but I'm having 6 or 7 sets made.
Ian