Dulcimer Tuning key T shape tuning key for dulcimer £12.00 £12.00 Add To Basket 8 in stock. 0 in your basket View Basket Checkout Nice comfortable tuning key. Having a T shape key puts less stress on the tuning pin then the angled ones. 4mm hole for 5mm dia. tuning pins. Made in Germany this item is made from a white hardwood but I dont know what it is. Sometimes when they are out of stock they send me dark timber ones.