Readjust Power Steering Belt Tension

What is your question?

About 3 years ago I replaced the belt for the power steering and I think it needs adjusted. I am not sure how much play there should be when doing this. I am thinking the old belt had very little play it but I do not want to over tighten it to much. There seems like about 1/4 to 3/8 inch of play at this time but I am guessing at that amount without actually measuring.