harman accentra fan ????

ok so I have been getting a clunking noise like metal on metal under my stove while it is running on high. I took the whole stove out and took the fan off the bottom and there is about 1/4 inch of play in and out not side to side on the shaft. Is this normal??? is there a bushing that wears out??? I looked on amazon and found a replacement for $93 Fasco b47120. Here is a link

http://www.amazon.com/Fasco-B47120-Speed-Inducer-Blower/product-reviews/B000BULTKE

do you think I should just get a new one??? or is there a easy fix?? please help me out if anyone knows. Thanks guys

anyone???? I have searched all over the internet and have found nothing.

That is the same exact blower Harman sells for $327. Same exact. Amazon right? You have to file down or bent the grounding thread under the stove so it doesn't scrape the bottom. Hint.... Do this after you make the connections