I recently bought a Yugo AK-47 that had a canted sight tower. I went on several forums and asked as well as searched for good posts for those with similar problems. I would like to drop this post in case someone in the future has the same problem and searches this forum.
I sent my rifle in to Century for repair under warranty. It cost me $25 shipping and 4 weeks later the rifle comes back with a perfectly straight sight tower. I was very happy.
If anyone has a similar problem the # is 802-524-5268 - option #2.