1. Sorry for long title
2. Basically what the title says. I've seen a few scuttles on different sites, and I've narrowed it down to something like a normal bowl with another bowl "around it" to keep hot water inside. As for size, whatever fits a 24mm brush 60mm loft. My current "one bowled" bowl has d=11cm in the bottom, and d=13cm on the top. I've found that this works nicely with both my brushes, so anything in apprx that size should work.
So if anyone has any reference to any sites / vendors or something like that, perhaps even recommendations, I'd appreciate it. Keeping the heat is a quite important ability the scuttle should possess.
Is that enough information? Its colour should be within reason