Some of you may be interested in the Wixey Digital Angle Gauge available from Woodcraft for $39.99. http://woodcraft.com/family.aspx?familyid=5894<http://woodcraft.com/family.aspx?familyid=5894> I got one primarily for my woodworking and metalworking, but it occurred to me that it is probably a more accurate gauge for setting the axis on my GEM than what I'm using now. I have not yet used it for that, though, so I might be mistaken. Also, once it has been zeroed to a known level surface, it might be better level than a bubble level. It reads in 0.1 degree increments, and is sensitive enough to read the thickness of one sheet of paper under one end of it. If you haven't been to their store lately, they moved about a year ago to Sandy. Bob Grant