Great tutorial, have trouble figuring how to low dome plumed agate. The bullseye, on a high dome, is a great idea, have been using crosshairs along the two axis, but think the bullseye would especially work great on freeform cabs.
Well Willy, In NW Arkansas, the problem is not having places to actually find something other than limestone or chert. Anyway, we envey you living in Texas=more rocks and bigger fish!