Learning how to use sketchup, I'm just playing with models from the various builds on OpenBuilds. I can manipulate parts ok, but for one thing: I can't figure out how to snap parts together in precise alignment based on a set of points. . For instance, how do you make a bolt object snap to the center of a hole with the face of the bolt head flush with the face of the surface where the hole is located? Or how do you snap 2 objects together so their faces are in contact and the are aligned on their center points? Seems to me this should be a critical part of the process but I'll be damned if I can find anything in the help files on it. Maybe its called something else, but I can find no info on this. Help!