[modeleng] Headers and domes

I'm fitting out a loco with a nice new boiler. Has anyone any thoughts on 
the best fasteners for the wet header and the dome? I'm thinking terms of 
either phospor bronze or cap head socket stanless in either case with a bit 
of copper grease and a jacking screw provision. Anyone any thoughts or know 
if I can get socket phospor bronze?

I know that with stainless I need to have blind holes in the boiler bush to 
avoid electrolytic damage to the screw but what about pb? it seems to me 
that by going all the way through I decrease the chance of breaking a tap 
but increase the chance of a leak.

Also I've been told (and Johnson Matthey's website bears it out that brazing 
stainless with Easyflo results in the likelihood of crevice or interfacial 
corrosion in the presence of sulphur and therefore that one should use 
Argobraze 56 instead. Anyone got any thoughts on this one?


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