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Mounted the cooler assembly to the lower cowling. Marked the center with tape and a sharpie, ground down the opening edges of the cowling for 1/4 inch spacing, which was a lot of grinding. Placed the assembly where it is supposed to sit in the end and then drilled the holes for the grommets. Three of them were fine, but the left hole was somewhat misplaced. I guess the cowling wasn't completely tension free and somewhat distorted. Fixed it with some epoxy flox and now the new fourth hole fits as well.
Then I fixed the assembly in place to drill and cleco the rivet holes for the F-12077, disassembled everything, machine countersunk the rivet holes and riveted the F-12077 into place. To do so, I couldn't use my pneumatic squeezer because the C-frame wasn't big enough. Therefore, I had to use the pneumatic hammer. Hammering from the outside creted a small dent in the fiber glass, hammering from the inside with the bucking bar from outside went a lot better. The result looks solid, even is possibly not as beautiful as those rivets set with a squeezer.

Last for the day, I mounted the cooling assembly to the gear box. To torque the screws to 190 in lbs (21.5 Nm), I used a scale which I pulled to 13.5 kgs on a 16 cm arm. Safety wiried both screws against each other and added some silicone to the top, to prevent the wire from chafing the gear box casing.

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