Originally Posted by
Jim Koepke
Really, can you imagine someone looking at a book shelf and thinking, "that top shelf is about 0.0003" low on the left side?"
I'm going to start doing that just so I can answer you in the affirmative!
I hope I didn't offend, I was just trying to point out that nobody wanted micrometer (or really caliper) precision in actual woodworking. I suppose 'as carefully as possible' left lots of room, I just didn't want the OP getting beat up for something he wasn't doing. Let's beat people up for what they are doing! 
I've only used a square to check a plane iron before I first-ever sharpened it to make sure I don't need to do any corrections. Frankly, most of my planes are LV or LN, so I assume they are square and sharpen based on the initial "macro-" bevel. The ol' Mark I Eyeball is pretty good keeping parallel to that, so I don't worry much. That said, I was recently working with a new-to-me vintage Stanley plane and noticed the lateral adjustment was very far to one side to keep the blade parallel to the sole, so your comments, Jim, definitely ring true.
daniel
Not all chemicals are bad. Without hydrogen or oxygen, for example, there would be no way to make water, a vital ingredient in beer.
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