BW - They do make a really nice device for assisting in changing harp, autoharp and hammer dulcimer strings. It goes by various names including "wife", "child" and "brother-in-law". Very simple to use. Just tell it, "You hold this here while I twist this other thing." Depending on it's age and or sex, you may have to buy it a beer, take it out for dinner, or let it borrow the car afterwards.

Bruce