The most "trouble" will be finding a .45 colt cylinder and extractor for the New Service. If you do find one, make sure that you get it from someone who will guarantee condition, as some old parts are in pretty bad shape.
If you do get the cylinder and are lucky, it will fit right first time. If not, note that fitting a Colt cylinder is not really a job for the beginner. It can be tricky and most gunsmiths today have no idea what is involved.
Jim
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