We drilled the hole for the forward attach bolt prior to installing the bulkhead by drilling through the bracket hole. We inserted the the bolt through the phenolic, the temporary spacer block and attach bracket to keep them aligned while the micro dried. We also drilled the top and bottom holes in the phenolic for the "boomerangs". When the BID on the forward side of the bulkhead was cured, we drilled the holes thru the BID using the brackets and boomerangs and index holes in the phenolic for alignment. After the BID on the aft side was installed and cured, we drilled from the forward side and installed the 3 bolts in the left and right sides. We then drilled the remainder of the holes through the boomerang and inserted all bolts.