Fabricated, installed and final drilled the T911 stiffeners for the L Fuel Tank. While at it, I made the additional six for the R Fuel Tank (not yet started). I used the W-932-DG drill guides to drill the first hole in each of the Tank Attach Angle Brackets. The instructions state that this hole must be very accurately drilled, so I while jigged for the Left Tank... I drilled the Brackets for the Right Tank to save time later. I aligned the Tank Attach Angles with a block and clamps to the Left Baffle and match-drilled them in the assembly.