Re: This was a necessity!!
Rob, I know what you mean about the pedal side chain . I have converted most of my multi speed bikes to single speed. Sometimes even with a offset link you can't quite get the right tension. It is bad news if the chain jumps over to another sprocket.
I will attach a picture of a sweet chain tensioner you can get from most bicycle parts web sites. They bolt on with the derailer bolt, and push up from the bottom so they work really well.
No more chain problems!