I removed a rotten 4x4 post that was used for a fence. The concrete hole seems sound. I was thinking of putting a 2 3/8 metal pole in this 4x4 hole and then filling with concrete.
I am not sure if there would be enough new concrete around the metal post to make a secure fit.
If this works I will probably replace all the 4x4 wood posts with metal posts.
Any ideas or previous experience around this would be appreciated.