Mark your guide lines / depth lines on the side for your barrel depth , web , and ramrod hole . Make sure your optimum T.H. position and breech is marked on the barrel . Drill a larger hole through wood to see the TH position ... Return barrel and pin it in , clamp near breech . Hold lock to where TH is in correct position to the pan , level with top and centered , slight adjustments can still be made later , get as good as you can .Position so front screw can hit meat on the lock plate and will go through the web of wood between barrel and R.R. hole ... Then ...while holding the plate ( stripped ) in optimum position , trace with sharp pencil ...the pan , pan fence , top of bolster full length and front and rear ... It'll fight ya , keep watching TH position and front screw position ...then remove plate ...take measurements thickness of bolster at rear and forward section , strike line and then start inletting the bolster ...inlet until plate sits flush on wood and check.all positions ... if problems correct them ...then chisel down to barrel ...when near barrel I use scrafice chisel because it'll hit the barrel ... Makes good sharp edges in the mortice so I like doing it this way . When bolster mortice is inlet completely , make sure plate is in good position , then trace the plate .... start inletting it next ....