After repeated attempts of getting my Vega utility fence just perfect,
I shimmed it at the locking head with three layers or blue painters
tape on one side to cause the end of the fence to be just -.002 from
the front of the fence.
It was easier than messing with the bolts one more time.
I've since seen in books that one should cut a straight board and jam
it into the miter slot and use a feeler guage on the far end to
adjust it for parallelism.