SNS3Guppy is obviously a very concientious engineer and probably quite wealthy in the process, he is, however absolutely correct in his observations, but, I used to carry a fully serviceable spare from an aircraft graveyard, never needed it but it was always going to be better than a tear down and a hell of a lot cheaper.
What is interesting is, I now fly a large corporate jet flying internationally and we carry a fully loaded spare, much cheaper to change a wheel than have a puncture repaired. It has been my experience that when a main lets go it is beyond repair anyway. We pay an engineer at home base to look after the repairs not an outstation somewhere else in the world.