The connection comprises: 3 x 1/4 inch tubes and a 1/2 inch to 3/8 inch reducer. It takes a bit of effort to get the 3 tubes into the reducer but they will go eventually with a bit of persuasion!
The great thing about brazing rather than soldering is that you have much better control over the metal. Soldering using a normal blow torch and plumbing solder gives you very little control as the solder runs way too easily. With brazing you don't seem to have the same problems so it's much easier to fill voids, which is basically what I did.
I don't have any particularly specialised equipment - just a MAPP Gas blow torch. I generally start with a pre-fluxed solder rod to get the metal flowing then finish off with a non-fluxed rod to fill in.
I'm no expert, just determined!
Nigel
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