This was a very interesting discussion! (Even though most of it is way over my head) I hope it helps the OP with his project. I don't have much to add except a MAPP torch is not hot enough for boro. I bought a rod mixed in with 104 from a destashing sale. It took forever just to melt it enough to make 2 regular length rods out of 1 extra-long rod.
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Shanna
"If you don't know where you're going, any road'll take you there"
Lewis Carroll, Alice in Wonderland
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