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From the NOC Paddling School:
Shoulder Safety
The ratio of a basketball to a golf tee is actually pretty accurate when describing the shoulder joint. Now imagine how easy it is to knock that basketball off the tee and you can see why shoulder dislocations are fairly common. If not for the skin, muscles, tendons, and ligaments that surround the shoulder, humans would perpetually walk around in slings. As it stands though, it’s only kayakers that perpetually walk around in slings. Usually, the paddle is the culprit when a kayaker dislocates his shoulder. Archimedes once said, “Give me a lever long enough and a fulcrum to place it on and I’ll move the world”. Your paddle is that lever, and although it’s only 197 centimeters long, it’s plenty long enough to apply the minimum pressure required to knock that basketball off the tee.
It's a very good article with pictures of Right Way & Wrong Way to do things. Well worth a read if you haven't already.