Jim,

I switch my Schwinn from same side timing and drive chains to opposite sides. Since mine did not come with an eccentric BB for chain adjustment, it had this ugly bracket and chain pulley system. Kind of crude but it got the job done. This is how it originally looked.



When I moved the timing chain to the left side I still needed to be able to take up the chain slack. I tried several different approaches, but ended up using this:



It is for converting a multi speed to a single speed that has vertical dropouts. It is intended to be mounted in the RD mount on the rear drop. I used spacers from my local ACE along with some quality stainless nuts and bolts to snug everything up. It works well and much better than the original set up.

Sorry about the slightly out of focus picture.