Haastech,
I appreciate the advise, I did check to be sure the machine is level. I also tried to place equal tension on all four jack screws although you end up chasing your tail a lot in that area.
I do recall that the indicator made a pretty good jump between one of the middle sections and the outside rail. That would figure into your concern that the table may not be flat. I'll re-check using your gage block method the next time I have the vises off.
I'm not sure I understand your explanation on shimming the spindle but let me try the above before I put you through any more grief.
Thanks Again Vern