Thanks Julio and PF.
Just loaded this little thing back up. Something that's been tweaking me since I first shot it, the infinity focus is good, but when you focus on something truly at infinity, the horizontal coincidence is slightly off. Just to be sure, just now, I laid a ground glass ag'in the rails and checked focus throughout the range. The rangefinder and ground glass were in absolute, complete agreement, all the way through. So I guess it's just a quirk of this particular camera.
As an aside, I have been going through old pictures on Photobucket lately. I used to take a whole bunch of pictures of the kids. I haven't been doing that for a while. I mean to rectify that this summer. Have this, the Spotmatic, and the Yashica-Mat all loaded now...