Now that the parking brake valve is squared away, I went on the other side of the firewall and riveted on the oil cooler plenum.

I didn't have a flush set that was long enough to get in the tight area on the vertical flanges where the plenum is several inches deep, so I elected to just go simple and used AN470 pan head rivets.

Behind the round flange where the scat tubing attaches clearance was tight, so I reversed those two rivets and was able to buck the shops heads on the fwd side with a bucking bar that has an angle on one end for just this kind of thing.

The cabin heat valve came with a small tube of flame master 1000 (red RTV), so I went ahead and permanently attached the heater flapper and used some of the extra in the tube to seal up the corners of the plenum.

Also fiddled with a few other things and burned up the rest of my shop time, but nothing very noteworthy