I have recently come across an upright Stella disc musical box
which plays 25-inch diameter discs.  Around the back of it there is
a small hinged door, about 6 inches square, which is locked and there
is no key.  Does anyone know what is behind this door?  Is it access
for lubrication or some other purpose?  I can send a photo bit I do
not think it will tell anyone anything.

When writing my book I did not ask people to pull their machines
out from the wall to tell me of any 'secret' access doors like this,
but I would be interested to know of any more on other makes.

Many thanks,
Kevin McElhone
Northampton, UK