Here is one of Devins Paragon sliders silver brazed to the chainstay.  Took me most of the day to get this far.  My, pretty much non adjustable, fixture was designed around road bike type geometry and didn't want to accommodate the higher BB and longer chainstays. But enough manipulation and a smashed and cut finger, it works quite well.  I used a 45% silver rather than 50% or 56% as it should impart more strength to the joint.