Actus,
You are both correct and incorrect at the same time.
The incident mentioned with the 135 was the second time Richard had conducted a field repair to MR blades. The first was on his first aircraft, a Gazelle.
I recall that the Gazelle repair was found to be outside the tolerances for further service. There was some official response, which was documented in an industry publication at some point - I think I might have chucked it, can't find it for now.
Richard's response was to educate himself and secure appropriate training and approvals as documented elsewhere.