Final Prep (Dimple, Countersink, and Shape) 04/21/24 – 0.5h The final step in this section is to ream a handful of holes from the forward and aft center bulkhead assemblies through bulkhead webs and side angles. The instructions laid out a specific process to complete this task, which worked well. My only addition to the procedure was to use a Drill Guide to help ensure no side loads on the holes during the reaming process. [.311 Reamer, .375 Reamer, Drill Guide]