steamer fired this volley in news:4ecff88a$0$1666
:

They're good for roughing in but not
really precise enough to tram a head to the kind of accuracy I like..

Yep, but production vs. time dictates that you use the _minimum_ precision
acceptable to the job. Since I'm now doing this for a living, I live and
die by the "what meets the specs" requirement.

LLoyd