Donald's frame is back in the Marchetti fixture after the main diamond brazing is completed, flux soaked and roughly sandblasted and filed. The photo shows a little clamp held on the centerline of the left rear dropout which supports a ruler which extends up to the back of the seat lug. A machinists protractor is used to determine the topstay binder/cap mitre angle by measuring between the ruler and the seat tube. Tomorrow the machine mitreing of the topstay cap and the rear wishbone brazing will be photographed and uploaded.