TerraCycle is a great place.
Or Pat Franz the owner is. I called and emailed him about the rumble on my limbo. So I dropped in since I can get there on my way to work and we spent an hour playing around. We wanted the idlers to float so they match the position of the chain. But I need to find a replacement bolt with more threads and so far I canít find one. The one on the bike is hardened and could not be threaded more.
Right now I am trying this position but I plan on bringing up the power side of the chain on top.
So far pretty much all of the rumble is gone and I donít feel the power loss. I have only ridden a couple times because the back wheel lost a couple of spokes (warranty is nice) but so far itís a great setup and pat is a really nice guy. He is going to let me try one of the suspension hubs and a front wheel to see if I like it before I have a wheel built with one.