I just found a Sekova 15 chord chromaharp in my grandmothers garage. She says it was a gift in the 70's and has never been used. It still has all the original paperwork and says it comes with a tuning wrench, but there doesn't apear to be one. Is it hidden in the harp somewhere like a judy harp tuning wrench? Any ideas of the value of this thing? I don't want to sell it but I don't want to drag it out on the road, chip it at a show and deprive my children, either.