I need to change the main belt on my beocord 7000, and I need help! I have in the past successfully changed belts on my 5000 and 5500, and there are subtle differences on the 7000. I have got to the stage of accessing the main tape unit, (thus being able to change the first belt), I have discovered how to remove the black plastic casing (thus being able to change the small belt), but I am absolutely stuck how to dismantle the unit further to change next belt (the large flat one). This was very easy on the 5xxx, but I cannot see where even to start on the 7000. Any advice would be gratefully received.