You can see the sharpie marks? those are the apex of the bends.
Vent holes have been drilled on the seat tube and on the lower ends of the seat stays, the same as with the chain stays in post #2.
Again, they are mounted in an Anvil fixture for mitering, and are mitered simultaneously.
The stays are then finish fitted at the top, mostly just burr removal, and the marked for slotting, spear pointed and the insides and outsides of the ends cleaned 1st with 80 grit and a dremmel, and then with 91% alcohol, again - much like the chain stays in post #2.
I do one to perfect fit, and then match the 2nd to it.
And, once both stays are on it's back to the alignment table for a check. Usually at this point the frame has enough different triangles that it does not tend to move or wander.
It's good to get it all sussed up at this point as once you install the seat stay brace the entire structure is all tied together.
Plus, it's nice to throw in the test wheel once again to check clearances and find out exactly where you want your brace to go.
finished brazing. I hope this has helped out!
- Steve Garro.