308 the inner bulkhead assembly 304 and the outer bulkhead assembly 306 are fixed to the aft frame 120 through the retention lugs 124 and 124 a the inner bulkhead assembly 304 includes a first inner bulkhead 316 and a second inner bulkhead 318 positioned on opposite sides of the aft frame retention lugs 124 and 124 a each of the bulkheads 316 and 318 has a plurality of axial holes 320 there through positioned for alignment with the slots 126 of the aft frame retention lugs 124 and 124 a in assembly a fastener 322 such as a bolt is inserted through each axial hole 320 of the bulkheads 316 318 and through the corresponding slots 126 of the aft frame retention lugs 124 from the exit side of the aft frame assembly 300 a washer 324 and a threaded nut 326 capture each fastener 322 on the forward side of the assembly 300 additionally bushings 310 are located on the particular fasteners 322 that extend through the slots 126 a in the laterally outermost retention lugs 124 a each bushing 310 has a second axial length a second circumferential length a second radial width and a through hole for receiving there through the fastener 322 in this configuration the bushings 310 reside within each slot 126 a of the outermost retention lugs 124 a and are preferably pressfit into the slots 126 a the bushings 310 are sized such that the first circumferential length of the slots 126 a is greater than the second circumferential length of each bushing 310 thereby allowing for relative circumferential movement of each of the outermost retention lugs 124 a and hence aft.