I've got an issue with the plumbing for the head on Grantala.
I brought in some 90 degree bronze fittings which weren't what was depicted in the online catalogue - ie they were supposed to take two sizes of hose, but turned up as a single size fitting. At least that supplier has amended their catalogue as a result - but, I still have the problem of a couple of skin fittings that need 90 degree elbows that reduce from 1.25 and 1.5 inch pipes down to 1 inch hose. Oh - and I refuse to have plastic fittings on any circuit that will be left open for any length of time.
So - I need to make my own bronze fittings up - from the supplied fittings and some 1" hose tails. The larger, 1.5" fitting looks large enough to just tap for the hose fitting, but the 1.25" fitting will need to be either brazed or as someone else suggested, silver-soldered. My welding supply shop couldn't help with bronze brazing rods and I'm a bit concerned about galvanic issues with the silver solder. Silver and lead are both a bit more noble than bronze - but it doesn't appear to be too far apart.
Do we have any galvanic series experts here who could add to the discussion? Calder, incidentally, hasn't got silver solder in the table in his book, but I did find it mentioned online elsewhere - at about the Monel level.