I started working the placement and alignment of BH A I started by leveling the fuselage and getting the distance right. I measured the 52 inches aft of the cage measurement on a piece of PVC to eliminate any tape measure error. I then marked a couple of marks on the tail cone floor. Once I knew about where it went I sanded away all the primer that was in the way of the install. I also did some fill work on the forward side of BH to get that smooth and looking good.