I always locktight the grip screws on my 1911's among many other things gun and non-gun related.
An electric sodiering iron is your friend here for removal, use it to apply moderate heat directly to the part of intrest, never had a problem with the finish on parts, but then I am only applying it to screws. While it may not get things as hot as propane, a slightly longer time at temp should make it all equal unless we are talking about fasteners you need an impact gun to turn.