I have a friend that is trying to level his pool table that he just picked up. The 3 piece slate is lining up perfect on and when screwing the feet up or down we have not been able to find the spot where it is exactly level. When raising one side up a hair the other is thrown off and vice versa. I am wanting to know if there is any suggestions and which way is the proper way (if any besides parallel to the rails) to position the level? Any suggestions would be appreciated definitely. Thanks for any and all, Trav D.