I have an RS Labs arm. Figure that puts me on the opposite end of the spectrum from most of the replies to this thread as I measure pivot to spindle distance by eye. Somehow it just works. When it comes down to it I'd rather spend time listening than worrying. Have a couple of friends that adjust VTA for every record. Personally think they are nuts but as long as I bring over a good bottle all is well.
Too many people spend way too much time over thinking this hobby and not enough time enjoying. But then again if teasing and adjusting to the last mm is enjoying to you I say invite me over just provide some other entertainment until the needle hits the groove. As soon as that happens we are friends again.
Beau