Ergonomics or common sense?
Typically, a tuner sets the key handle from 13 hours and driving it's down when he (she) tuning upright piano. However, this is bad method for a keeping the resource of wood bush and a hole of pinblock. Why? The external force of pressure up of a string to 100 kg acts on the wooden bush and the hole. A tuner have additional pressure one when the key position is from 13 hours down. As result bush and hole of pinblock acquires an oval shape and, as a consequence, the lost pin. What to do? How to hold the handle of a hammer? Max made that clip, where he advises keeping the knob of the tuning key from (9 hours to 12) up. This is inconvenient for the tuner, if he is right handed, but this technique can save and extend the life of your piano. Max have his wishes of pleasant and useful viewing: