[sdiy] Looking for mixer scribble material

[Richard Ford]

I have a Behringer MX3284A mixer that does everything I want it to do,
but it is missing just one thing. At the bottom of the mixer is the
recessed area where the scribble pad should be. Behringer don't supply
it with the mixer. Does anyone know where I can obtain the type of
plastic that is used in this position.

It obviously has to be able to be used with the china graph pencil. I
don't want to use masking tape as used by many people live.

Any known suppliers (preferably in the UK)
-- 
Richard