I've been wondering why some Valley tables have super fast cushions (low nose height). Used to think it was mainly because of improper cloth installation, but putting brand new rails on 2 identical tables, and having to shim the rails up on one and not the other got me thinking it's something else. The cabinets often tend to sag in the middle causing a low spot in the center of the slate which is fairly easy to shim up. But now I'm thinking the rails can also sag toward the center causing the nose of the cushions to lower. Threw a square onto a table I did last weekend, and sure enough, the face of the rail is not plumb. It's worse in some spots than others. Might look into some sort of bracing to address this in the future. Wish I could convince the owner to scrap these things for Diamonds, but that's asking a lot around here.
