[QUOTE=wfwhitaker]1/8" variation on the target doesn't sound like a lot. Depends upon how high the enlarger head is set (what would otherwise amount to magnification). Possibly the glass in the carrier is providing its own reflection and may not be completely plane parallel. The question is whether or not the negative itself is orthogonal to the optical axis. But again, 1/8" doesn't sound like a lot....

1/8" out of alignment is significant as I have found since I started using the laser alignment tool. I think you may have highlighted the problem though when you mention the reflection. I sometimes get two laser spots bouncing back from the glass but one is always stronger than the other and that is the one I use for alignment purposes. I also use a Zone VI VC enlarger and to my sirprise I noticed that the head does go out of alignment when moved up and down the column so I re-align every time I set up the enalrger to make a print.