My mom has a Limbertwig apple in her yard that was planted by her dad. It was started from a layered branch in the early 40s. His dad started the original tree from a seed in the late 1890s. It's about 20 feet tall and the top limbs droop to about 6 feet from the ground. Is it possible to bench graft these and get them to grow upright? Would I have to train the leader to a stake to get an upright trunk or graft the scions to branches of an existing tree? I'm not sure how it was trained or even if it's necessary. I'd like to have a couple of these on semidwarf rootstocks near my house. They are a nice weeping tree and the apples great. They keep for a long time, too. I'd appreciate any advice I can get.