I replaced the felt drum seal and this once creaky, noisy, clothes-destroying, streak-leaving dryer animal is humming like a bird and I'm one happy customer. I was trying to decide whether to pay $400 or much more for a new dryer or fix this one. With the cost of the drum seal at $50, I decided to fix it myself. The hardest part was cleaning the old glue after removing the old seal. I used ammonia to soak the caked on glue and then a wire brush attached to a drill. Actually, it wasn't hard, it just took the most time. The process is very easy, especially with the video on this website. I think a lot of lint had been escaping through the old felt drum seal so it was VERY dusty dirty. Of course, I cleaned this up.
Before lifting the dryer drum from the machine by the belt, I took a picture with my cellphone of how the belt was attached to the roller wheel. After replacing the felt drum seal, I found it easier to lay the dryer on its back to wrap the belt around the drum and re-attach the belt to the roller wheel. Luckily, my belt was in good shape but if you think yours might not be, this is a good time to order a belt and the felt drum seal. And when replacing don't forget the grooved side of the belt goes against the drum!
I notice that my clothes are drying a lot quicker, so not only was lint escaping but so was the heat apparently. I am shaking my head at why I waited over a year to fix this. I guess I thought the only fix was a new dryer. This dryer has to be about 20 years old and I bought it used after replacing the heating element on a new dryer TWICE. So I'm not at all happy with these newer appliances or the thought of purchasing one. I'd rather have an old workhorse that works. The part arrived very quickly.