The folks that did the rework encouraged me to send it back for them to examine and repair. Not sure how many inline 6 dampers they have done but said they couldn't remember one of their dampers failing like that. I did tell them it was on a hopped up 292. Seems like they care about their product and view it as a challenge. That appeals to me so I sent it back to them for another try. We'll see what they say.
