Would that all of us had such excellent filing systems. I just offered a lens to someone saying that it had a recent CLA. Now reading this I wonder where that paperwork might be. Fortunately I had an email conversation with the CLA person, so I can date the event, even document the cost, but no longer have the time test results. However that can in no way attest to the lack of use that lens has had since that date, the reason I was offering to sell it.
Perhaps we need to invent a usage meter of some sort to satisfy those of little trust. The power boat I have had for the last 25 years has a meter that records the hours the motor has run. The sailboat I had for 27 years before that had no such meter. The new owner of the sailboat said, "I have never seen a sailboat like this with such an extensive inventory of replacement parts." I said, "Yes, in 27 years practically everything broke at least once. I had to learn how to fix that. Each time I bought two parts, the one I needed now and the one I might need next time."
How will we satisfy those people who need more?
John Powers