Hoover TV630 Drum out of guide?

Hi - I have a Hoover TV630 dryer. Over the past few days it has made a terrible squeaking noise, then today, a grating noise and stop! Opening the top, I could see that the drum has come out of the plastic guide that it is meant to fit into. Turning it on it's side, 2 metal washers and broken pieces of what looks like a square spacer dropped out.
Is there any way that I can repair this and if so, how?
Can I access the back of the machine?

Thanks in advance.