Thanks to both Scooper and Retro G.

It is clear to me now. What I was somehow missing was the concept that, regardless of the width of the cassette, that the dropouts are symetrical with respect to the centerline of the frame, therefore the wheel is always centered between the locknuts [i.e. dropouts]. I was somehow laboring under the misconception that the frame was somehow manufactured with one dropout further from the centerline to accomodate the cassette. Jeez . . . a quick inspection of my bike just now showed how ridiculous that thinking was. <g>

Thanks again to this forum!

DON