Jason Marshall wrote:
You're all a bunch of smart guys, maybe you can help a poor Canadian
hay farmer find or make about 1000 cinching tie-downs similar to
this:
http://www.inlandtarp.com/Super%20Cinch%20Tie-Down.htm

Would this work for you?:

http://www.geocities.com/roo_two/Versatackle.html
To tighten, all you have to do is pull and let go. It's self-locking.