The custom close quarters dimple die arrived from Cleaveland tool.
It's just like their normal 3/32 close quarters dimple die except they
made this one with the tank die recess instead of the regular dimple
recess.
It looks like it's small enough to dimple these holes even though they are
really close to the bend radius of the baffle flange.
Setting the baffle (with Z brackets attached) back on the spar looks
like there's gonna be enough room for the dimple and a shop head.
Here's a flush rivet put in the wrong way to simulate a shop head. Still
looks good...close but OK.