Well, tiredof the piece of paper trick I bought an edge finder.
Didn't work all covered in protective grease. A little WD40 sprayed
on shop wrag and, VIOLA! It worked perfectly when I tested it.
Exactly like it was supposed to. Wobble, steady, offset. A test slot
milled in a piece of scrap mic'ed about .001 off. Not bad. Then I
went to actually use it to setup a work piece and whizzzz.... the
neat little makes a dandy top on the mill table until it drops in a t-
slot. I put it back together and whizzzzz... did I mention that the
feeler end makes a dandy spinning top until it drops in a t-slot.

Wadda ya think? A tiny dab of purple Loctite on the screw and feeler
threads?