So I purchased a used Singleator from a friend the other day. The Singleator was in excellent condition (he's running an eccentric hub now). Ran it Push Down for a ride, then decided to run it Push Up today. Worked fine when I rode it in the morning but when a friend of mine borrowed the bike this afternoon, the Singleator tension spring quit working on a rough, rocky and fast descent. Since I didn't have an 18mm cone with me, I had to resort to using a bunch of rubber bands to yank the pulley arm up to give some tension (worked pretty good actually). At least she was able to finish the ride without walking. Got home, put the thing on the stand and fiddled with the tension adjustment. Come to find that the friction on the der. hanger is not enough to hold the tension spring adjustment (and I didn't really want to strip the hanger threads by really cranking down on the der. bolt). Did a search on mtbr to make sure that I didn't screw anything up (I may have cranked on the spring too much or turned it the wrong direction) and I find that a lot of people have had similar problems. It also looks like some people came up with the same elegantly simple and cheap fix as I did...