what is this dryer part?

I'm trying to locate the source of an ear-shattering screech coming from my dryer. The rear ball and socket were replaced just six months ago. The front felt ring was replaced then, too.
I pulled the drum out and looked for signs of wear. The only thing that looks suspicious is a bit of the rear of the drum, which looks like something has been rubbing against it. It's left a wear ring, perhaps an inch wide.
I looked inside the back of the enclosure to see what was rubbing against it, and the only obvious candidate is an odd little piece of plastic that juts out about two inches, screwed into the rear of the enclosure. It's bright yellow. I can't imagine what it's purpose is. It doesn't contact anything but the drum. Anyone have a clue? There is another one at the front of the drum, but it's mounted in a different orientation, and doesn't contact drum. It has to be removed before the drum will slide out, but otherwise I don't see how it could be functional in any way.
The only thing that came to mind is that perhaps it functions as some sort of stop limit, as the felt wears down, to prevent the drum from going too far out of alignment. But, as I said, the felt is new.
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clipped
I suspect you're right that it is a stop limiter but not as a safeguard for felt wearout but to help keep the drum centered when the dryer is not level from front to back. This would keep the drum from riding against either the front or back constantly instead of being centered. Check the level of the dryer, it's important that it be level. Also while you have it apart make sure that a screw,nail, etc. hasn't fallen out of a pants pocket and gotten stuck in the felt or elsewhere where it can rub on the drum as it turns. I had this problem with a new GE dryer and serviceman found a screw that I had left in a pants pocket stuck in the felt.
Tom G.
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I am assuming that you have a Frigidaire product. I am also guessing that you have taken the drum out to check things over, and that there is nothing out of the ordinary going on. So, you are pointing at that yellow thing in the rear as the culprit, and is there an way you can post a picture somewhere so that I can see what you are talking about? I know about the one in front.
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Here's a photo
<img src="
http://show.imagehosting.us/show/1510003/0/nouser_1510/T0_-1_1510003.jpg " alt="Image Hosted at ImageHosting.us"/>
I left it out and reassembled the dryer, and the noise is gone. I had thought earlier that it might be a problem with the dryer not being level, causing the drum to slide back and rub on something. However I don't believe the rear ball and socket would allow to drum to slip backwards, and tilting the dryer forward did not affect the sound.
So what is this thing? The undocumented "squeal so loud that they can hear it in the next county" feature?
b.c.
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It goes on the front at the top, at the ede of the drum. I have never figured out what it is for, but I think it is to keep the drum up in case there is some sort of component failure that would make it move forward too much. If there has been some tweaking to your dryer cabinet, it is possible for the drum to hit the part under normal operation, and leaving it out won't do any harm. I don't know the technical name of the part. That is how important it is.
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disconnect the belt from the idler pulley to run the motor alone and listen for motor bearing noise?
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