'If left on the headstock for any length of time, the solvents in the tuner pads can damage the instrument finish.'

most guitars look like they've dragged backwards through a hedge after a few years in folk clubs Dave. you'd have to be very anal retentive to worry about the damage done by the pads of the tuners.

what the original poster fails to recognise is that the guitar usually requires adjustment with every change of key and certainly of tuning. Tarrega said he had spent at least forty of the fifty years he played guitar just tuning the damn thing.