OK. First off. The belt on the tension sits positioned toward the front of the pulley. It actually extends over the edge by the width of less than a penny.
But it looks like it did that on the original pulley which I found and it shows a grease line where the belt sat. .
Here is a picture. The first two are the Flennor one installed. The third picture is the one I replaced, bought from pelican parts in jan 2014 shows how belt sat on that.