Stumpjumper, thanks for responding. Yeah, I think you do need longer crankarms (I was fortunate to have the Cooks Brothers crankset packed away. You'll probably recall they came in rather odd sizes - 171, 176, 181 - and, luckily, I had the 176 size, which seems to work great on a single-speed / But what do I know?).

Anyway, I'd suggest putting a "Need A Crankset" 3x5 card on the bulletin boards of local bike shops, because I bet there's lots of folks with old crank arms they'd be willing to part with for little $. Plus, doesn't "Bike Forums" have an on-line bulletin board (I'm new to all this)?

How did you handle, (1. the single cog on your rear Shimano hub, (2. Your chain tension, and (3. What's your chainring/rear cog combo?

Well I'm going to "single-speed" to lunch. Chat with you soon.