best way IMO- to insure proper parts pertaining to Parkers when dis-or re-assembling same- use masking tape and magic marker pen- number them in order as you remove them- especially since Parker guns had "indexed screws"-- sure sign of a ham-fisted bozo when you see miss-timed screws with boogered up slots on a Parker-

About three years ago I sent a set of 12 gauge FWE 28" field grade LC Smith (Armor steel) to Simmons for a friend in Iowa- he had his father's 12 FWE Ideal with ruptured barrels due to snow obstruction in a Winter rabbit hunt=-they did a first class job for him-- But I agree with Bruce and others, any competent gunsmith will strive to keep ALL the parts with the particular gun upon which he is working at that point in time-