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.