Ok, as ridiculous as some of you may think it is to use so many levels, here's something to think about. When using (1) single level, you place it in various places all over the slate in order to get a overall reading of the level of the table...right? Well...one of the problems with using only one level is that as you make a change to one spot on the slate...you don't see the effect of that change somewhere else on the table...so, with the use of multiple levels...as Greg, Mark, Chad, and myself have discussed in the past...you can see everything...every change, and counter change as you level the slate. As Mark mentioned, on 3 piece slate tables, after you've leveled them, then come back and bolt down the rails, it can, and sometimes will change the level of the slates with the downward clamping pressure of the rails being tightened down on the slate. This discussion of the use of multiple levels has came up several times, I'm glad to see Paul actually implementing the program, thanks Greg, smart move...as usual..LOL
Glen
PS. When leveling slates, you have to look for the "Cause & Effect", meaning a change of level here, creates a change in level there. The ONLY way to see the "Effect" is with the multiple levels.