My apologies, I am not aiming to be confrontational. I thought you could shed some light on the subject since you often suggest people should use the low temp controlled chemical process rather than traditional method. I worked for one the three firms you listed and appreciate your rule of thumb regarding restoration, but I can assure you the cost is not related to any risk of damage. The cost is related to the hours it takes to disassemble, clean, anneal, polish, chase engraving, prep and process the parts, reassemble, etc. Send in a prepped part and the process usually cost a couple hundred bucks, not much more than regular bluing. I think with any restoration you will be much better off choosing the original factory processes, thats jmho.
