[dgail620]

From what I understand, this carriage (and the one I'm replacing) are an upgrade from the ones with the nylon teeth. These are supposed to be made with metal, although it be a soft metal so it won't tear up the screw drive. With a soft metal, we have issues with it tearing up easily, just about as much as the nylon ones. I think this received it's last rites when the broom handle got stuck in the track and the garage didn't shut off as soon as it should.
I think I may need to further stabilize the whole garage door opener to see if the vibration would go down some. I've never heard one as loud as mine.