It looks to me like you opened the exhaust port too far and the edge of the ring got caught in the portWhat say you? First time I've ever hung a ring in hundreds of builds. Ports were chamfered then hand sanded with 400 grit
Thankfully I don't have a lot of experience with this happening
I knew I could post here amongst friends and not be ridiculed
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Don't wait till the last minute. There's gonna be gremlins to chase.