I gather it is only a matter of time for these springs to break and I should start now procring a donor? The spring on my lightly used GT came unwound during a ride when the pin came out of its anchor point in the derailleur body. I expected to find a broken spring but the pin was still there only not bent at what I assume would be the proper 90 degrees. I could not manage to get it all back together with the pin like that and took a chance straightening the pin. It's been working fine since, but maybe this is not the derailleur to use on my 20 mile commute?