CAUTION --DO NOT ATTEMPT TO EXPEDITE ASSEMBLY BY THE USE OF OVERSIZE TOOLS/TORQUESINCREMENTAL LOADING IS REQUIRED IN THE SEQUENCE DESCRIBED BELOW.ONE- STEP LOADING COULD RESULT IN A LOOSE MANTLE AND DAMAGE TO THE HEAD.NOTE THAT LOAD CONTROL OF THE JACKSCREWS IS ACHIEVED BY MEASURING THE GAPS THAT ARE PRODUCED BETWEEN THE LOCKNUT AND THE TORCH RING . THE TARGET FOR FINAL AVERAGE GAP IS 1.5MM . THE FIRST TORQUE CYCLE PRODUCES THE BIGGEST GAP CHANGE. FOR A THE TARGET GAP SHOULD BE ACHIEVED IN 2-5 CYCLES. WITH 3 CYCLES IDEAL.