On my HP33E the keyboard rattles - or more precisely, the keys rattle. The lower row of keys is relatively firm, but towards the upper row, the keys get looser and looser, a mm or so, however, all keys work perfectly. It appears like the underlying contact-board has been forced inwards, is this assumption correct and is it possible to take the calculator apart and fix the problem - although I don't like taking things apart when they work.
Any assistance would be much appreciated.
Regards, Bo Kristoffersen Copenhagen/Denmark