RV-9A: Left Fuel Tank - 5/3/2006
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 Used the W-932DG Drill Guide(s) to drill the holes on the flanges of T-912 Attach Angles
6 of the 7 T-912 attach angles get holes in both the flanges. The 7th angle only gets one hole. There are 4 W-932DG Drill Guides in the kit. I supposed that's because they tend to wear out during the drilling. I used 2 of the 4 drill guides on this tank. I'll use the other 2 on the other tank, when I get to it. I put a 2x4 under the flange during the drilling for some support.
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 Marked lines on all the flanges centered on the 1/8 holes
I used the W-932DG Drill Guide again to make marks on the flanges on each end with a sharpie. Then it was just a matter of connecting the dots.
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 Enlarged the 1/8 hole on 6 T-912 Attach Angles
I enlarged the 1/8" hole in one flange of each of six outboard T-912 Attach Angles to 3/16". The 7th bracket is not drilled out. This hole is where the brackets attach to the main spar of the wing.
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 Clecoed the attach angles to the back baffle of the tank
It's time to back drill the rest of the holes in the attach angles using the baffle as a drill guide. I saw on Mike Schippers website where he put put some buckets under the baffle to hold it up allowing this job to be a lot easier.
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 Back drilled the attach angles
All I had to do here was line up the marks I made on the attach angle flanges to the holes in the tank baffle. I held the angles in position using this cool vise grip I got at Lowes (Aircraft Supply and Lumber).
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 Voila!
Hey, the holes line up! That's a good thing.
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 Temporarily pop-riveted the attach angles to the tank assembly
I clecoed the 2 end ribs of the tank assembly to the outer attach angles from the inside. Then I put these temporary pop-rivets in 2 holes on each bracket. I had to grind down the top of the pop-rivet gun to get it into position. UPDATE 8/20/2006: Apparently I forgot to final drill all the holes from the Z brackets, through the baffle and into the ribs. When it came to time to put in the final pop-rivets when sealing the back baffle, I had to drill out the holes because the pop-rivets wouldn't go into the holes. This made a mess in the tank, which requires waiting for the proseal to set and flushing out the tank with lots of water.
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