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I first line up my eye to both the leading and trailing edges of the apropriate side of the blade (the teeth, not the body of the blade) and then, without moving my head, adjust the mark on the piece to line up. All this with one eye closed. I don't see the problem with paralax. I get cuts right where I want them...
Bob Davis, thanks for the pics in abpw, cool guard. Am I right, the sides pivot up independently with the top remaining stationary? Much better & simpler design than I've seen before! Ever considered/tried connecting dust collection to the top? Seems I get too much dust, what with a zero clearance plate.