Sure did but my first attempt to do one like you did failed. The spring that I had with my old foot peg had no where near enough tension so that got tossed in the scrap pile and I started from scratch. Best part was, I had the skateboard wheel laying around and was brand new (Still going to get a wider one eventually), the steel I had laying around here along with the 2 bolts I cut down to fit, and the spring cost me under a dollar at the local hardware store. I did cut about 3-4 coils off the spring to fit and work. But here are the pictures. Never mind the super dirty bike. Its been washed since and is nice and clean now. haha
It works AMAZING and no more sloppy chain. I am eventually going to redo it a bit so it looks cleaner on the frame but for now, it works and I am riding!!! Riding season is almost over here so I didnt get to crazy with it in the looks department. That will happen over the winter.
Anyways, I hope that helps someone else also. I prob have $15 tops into it if you include the cost of the wheel. Also, the arm the wheel is mounted too, I might redo it and make it a little longer so I can move the mount back a bit for a cleaner look if I cant figure something else out with how its mounted now. Took me all of an hour to make once I settled on a design/idea.