The rib use to line up but over time it has moved to the right. Twenty years ago, it did it and I laid a 2x4 along it and knocked it back, then it did it again so I tried the 2x4 again but this time I broke a post off. This is a milled rib gun and it cost too much to get it repaired, so now it is to the right again and I don't want knock a post off again. aka Bert