Thanks for the responses.
I didn't say that my engineer approved!
All I was trying to ascertain was what exactly the legal position was regarding seat belts.
I own a garage and we regularly send failed seat belts off to a specialist to be repaired. I am perfectly happy that this is a safe practice, otherwise I wouldn't allow it on my customer's vehicles.
I am also aware that nearly all parts on an aircraft have to be approved, I just want clarification BEFORE I speak to the engineering company who have been assigned the work.
I have no intention of compromising either legality or integrity, but IF I can comply with standards AND save a fair bit of money, then I will!
Nobody is trying to cheat anybody here!