Oh, no, I definitely will attach to the seat post. I guess I didn't make myself clear. That was the whole issue. Since the seat post is angled, relative to the ground, the whole bike angled downward and the front wheel didn't have any clearance at all. It literally rested on the floor. But the cinder blocks, as crude a fix as that is, seem to be working well.
I was surprised there was no extension available, too. When the reply said "like we did in the sixties," I began wondering how old the bike stand really is. Well -- it was free.
BTW, the guy at Park Tool did send me PDF files of schematics for the stand. This, I think, was in case I went the machine shop route.