I've never humidifued shuttles before, and as shuttles are so expensive, I am reluctant to do so if it is not needed or incase I reck them etc. Does humidifying shuttles cause the cork base to soften? If so would this not negate the benefit of trying to extend the life of the shuttle as the feel will be all wrong....? Or is humidifying just for very old shuttles or in very hot countries? Advice gratefully recieved.