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You can use the Magnet Tool to create, move, and delete individual magnet points on a shape, click it twice to persistently select it and click on a shape to create a magnet, click and drag to move one, and Option-click to delete an existing magnet.

You can also use the Connection Inspector to add magnets at the cardinal point set as well as putting N number of magnets distributed evenly along a segment of a shape's outline.

That should get you where you want to be, hope the above helps.
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