Cleaned, fluxed, and ready to silver braze. On my ride into work, I determined that I needed to remove 10mm more from the bottom bracket end of the seat tube. This will allow a full 100mm contact area for the Thomson seat post. I'm sure their minimum insertion requirements have a safety allowance built in, but the full 100mm is now available.
All brazed with 100% penetration. After the frame is complete through the braze process, I will go around with low heat and a stainless wire brush and remove any errant silver braze.