Drier unit WJD 1257 W?

Hello Robbie, Thanks so much for the E90 solution; am just about to use the hair drier now!
Have just got this one second hand and carried it on its side; so guessing water got onto the boards...
Whilst doing this I noticed that the tiny drier pully belt was loose and badly worn, due (I'm guessing), from the large round enclosure that it drives being semi seized up.
My question is: is this worth dismantling to attempt a repair or is a new part the only option?
Thanks for your time, Kim