How to prune an older Malini tree (columnar apple tree)

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Markus Kobelt the founder and breeder of the Swiss fruit tree nursery Lubera.Talks about how to prune an older Malini tree, well it's pretty simple.
You have to learn only 1 rule: Prune everything back to 15-20cm from the middle axis. Malinis are by far the easiest apple trees to prune.