I just went back and re-read your post. Not sure why you received the letter you did, as these guns will run a long time. My model 29 from 1968 is still as good as it was the day it left the factory.

Now, in my limited experience, your issue is with the cylinder stop. There are a couple of things you can do with the cylinder stop, and if those do not work, then a new stop will need to be fitted. I have had a couple that the old stop worked after stoning, and one that the cylinder stop had to be replaced. It is not a difficult job,but needs to be done by someone who knows how. I still think the factory is a good option.

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Richard Gillespie
FBINA 102