Product review (4 stars): When your drier sounds like steel scraping on a chalkboard, you need this.
It's a bit involved to do the work.  But as long as you follow the directions & keep track of your screws & other parts while you're doing it, there shouldn't be any problem.  And this fixes that screeching noise from the bearing grinding on the post.
The first time the noise started, I just tore down the drier & cleaned the lint, grease, & metal shavings out of the bracket.  Then I put some high temp grease in there and reassembled it.  It lasted several years, and was stull doing fine.  But I had to replace the heater coil too.  Since I remembered that this was squealing before and had some wear on it, I decided that I'd replace this while I had the drier taken apart.  Check you tube & google for tips if you haven't done it before.