Probably applies to most tree types, but what if a young White Sapote tree wants to keep growing higher and you want to keep it smaller to harvest fruit. If you just do a big prune every year will this stop it from developing the size trunk, etc, required to begin fruiting?
What does a metric clock look like? I bet it is nothing like this tiny ad:
Large Lot for Sale Inside an Established Permaculture Community — Bejuco, Costa Rica