Originally Posted by
CliffordK
Actually, you could gain about 2" by simply cutting off the seatpost mast, and adding a quill seatpost.
Brazing (fillet brazing) would give you less penetration and distortion of your joints.
Sounds like cropping the seat tube may be good enough for ride height. I have told the owner to look for a quill type seat post that will fit. If all I have to do is lower the top tube for stand over height, I can do that fairly easy.
I am told that the builder likely used 4130 straight tube. From the Miller Welds site I see ER-70S-2 filler is preferred, which I have.
I have not brazed anything since welding school 35 years ago!