We had our bathroom remodeled two years ago and the drain housing rim appeared to deteriorate.  See attached photo.  Since I originally purchased the tub parts from Wayfair, I was able to find a replacement part.  Install was easily done with the right tool.  Perhaps the hardest part of this repair was removing the damaged drain housing, but nothing a good breaker bar with the drain wrench couldn't handle.  Hopefully the replaced part will last longer than 2 years.