My wife and I just bought a beautiful 160 year old hand hewn log home. We knew when we purchased it that we had some work to do and some more money to spend. That being said, there are two logs 24′ long 14”-16” tall and 10”-12” thick that are located just above the second floor that bow outward at least 4” in the center. How do I go about straightening them? Can they be straightened