I don't have the experience to comment on who may be at fault.
I would like to say that this thread has proved invaluable to me.
I have been taught that whilst carry out my check A on an R22 to visually inspect the tail boom. What for, I never really new until now. If I had seen a dent in the body work I probably would have thought it was superficial and nothing to worry about. I now know better.
Thank you all for that valuable piece of knowledge.
H.