Finally returned to Donald's frame. The wishbone top stay binder was machine mitred with a 31mm T&F mitre cutter to precisely match the outside diameter of the seat lug. The top stay is then cut to length and a brass preform ring is inserted before the binder and stay are fluxed. Brazing of the binder to the top stay is done in the Marchetti fixture with the wishbone rear triangle held upside down to help the brass flow and completely wet the inside of the stay and the binder. The rear triangle will now be removed from the fixture, dunked in the flux soaking tank and finish filed.