“Hello, John. Can you please return my rifle back to its original state and remove any works that I haven’t agreed to? Ta. “

It’s rather cheeky and unprofessional to be honest, incidents like this can destroy many years of good reputation. I’m quite surprised someone as well thought of as John Bowkett would stoop so low with such busines practices. It certainly sounds like any warranties on his work aren’t as good as previously thought.