Bike Shop Update
I finally got tired of rummaging around in a cardboard box whenever I needed to find just the right stem:
25.4mm on the left, 31.8mm in the middle, 26.0mm on the right. Simple and easy. I change around stems and bars a lot, so I appreciate this.
I also sold my old Trek 510 last night, so I have a bit more room in my shop now.