Exhaust Manifold back pressure sensor port stripped

[Rocketman]

Good Evening,
I’m in the process of changing out the Exhaust Manifold back pressure sensor tube but the port in the exhaust on a CM 2350 ISX15 stripped. Does any one know how to fix this ? I don’t want to replace the entire manifold as it is not leaking anywhere. I’ve scroll through many posts but unable to find any thing close to.

Thanks Much