Re: Gap

My understanding is that most lug sockets are a huge overkill WRT the amount of tube socket overlap to attain adequate strength. So gaps that exceed the .005", often, quoted amount for56% silver gap the strength should lessen at these points. But there's so much surface area and the fit is not consistent across the interface that these concerns about gaps is, as Richard says, overstated.

I chose to use bronze filler with lugs for a few other reasons too. Not just the gappy fit up of a hugely changed lug angle but cost and the challenge to get comfy with flowing bronze too. Another is borrowing from the jewelry industry. There are joints that have more than one brazing cycle and having the first filler melt at a higher temp than the second braze's filler helps prevent melt out of that first filler. Seat stay caps and their attachment to the seat tube as example. Andy.