I have never used a jig before but I just got done building a Balsa Nova (fully symetrical with double taper) and they have you pin the main spar against the board and they rest the ribs on a 3/8 hardwood dowl. They give you the location on the plans to place it and it seemed to work out well. Just make sure the dowl is straight and tightly pinned down.

The neat thing about this is you can dial in a little wash-out just by moving the dowl. Just check your measurements before final glueing.


Scot