Before Ian designed his tensioner system I designed one to work with an 80 tooth cog pulley. I commented a few times that my design was better than his when he put his for sale (I tried to find the posts but couldn't).
Well -> Ian's is better!
Here is a page on my website where I admit his is better and still leave the pictures of my system up.
http://www.superstang.com/tensioner.htm
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