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Hi,  I have a 50 cm upright Polyphon.  It works and plays very well.
However, whilst it plays a full revolution on the X1 setting, it stops
just short of two revolutions on the X2 setting.  Can anyone suggest
how to adjust this, please?  It is mentioned only in passing in the
disc musical box handbook

Thanks,
James Waterfield
http://www.maudfoster.co.uk/