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> Can anyone please post instructions or stories of success w/ propagating
> apple trees from root cuttings?

Tanis,
Perhaps a little explanation would help us understand what you are trying to do.   
Are you trying to make own-rooted apples, or just make rootstocks.
I've never seen root propagation of hardwood trees really work - it may work - but I haven't seen it.
Why would root propagation interest you rather than, say, air-layering?   Obviously these processes are reverse of each other.    In root propagation the challenge is getting a root to throw a sprout, where in air-layering the challenge is getting a branch in the air to sprout a root.   
Charlie Paradise