Mike, I know the extension ribs on L.C. Smiths were brazed on, the top and bottom ribs were soft soldered. The loop (lug) was held on by a screw from under the top rib to the loop and then soft soldered.

I think that brazing would also add too much heat as brass melts fairly high. Silver solder is high also. The small diameter that I use for silver soldering my band saw blades, I either had to use oxy/acetylene or Mapp gas in a bottle to make it flow, propane would not do it.

David