A centre line is marked on the jig and an old hub and gear to keep centre bar in position. You can't see it in this photo but the bar has a loop bent into it which will act as an up stop for the iso-fulcrum assembly.



OK...it the front bracing is complete. Sure, it looks complicated but it's the simplest part of the build so far. It doesn't hurt to have a few lines running perpendicular to the centre line so that you can line any cross pieces etc. up nice and square.



Iso-fulcrum hinge tubes. What can I say? A piece of well-oiled 1/16" piano wire (huh...where did it go?) holds the 3/32" OD brass hinge tubes in alignment. I tacked them in one spot with a small blob of silver solder. Also carefully brushed a little acid flux on the places (including the inside of the bracket) where I wanted the solder to flow. Bring on the torch.



A little bit of heat from the torch...a little bit of capillary action and the solder disappears into all of the tiny crevices. Be careful that the solder doesn't get drawn into the tubes.



Here is a shot of the inside of the bracket. The silver solder on the outside was drawn along the inside of the bracket. Too much solder and it gets drawn into the business part (where you don't want it) of the tube regardless of the oiled piece of piano wire. If it does get into the tube...save yourself a lot of grief and start the last couple of steps over again with clean tubing.

Next part will be the floppy hinge bits.