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I've attached my collection of arrow shapes. Once you choose a Custom shape and draw it out by clicking and dragging, click on the path with the Path Selection Tool (black arrow just above the Pen Tool) which will select the path and show the anchor points. Hold down the Command/Control (PC) key to temporarily turn the Path Selection Tool to the Direct Selection Tool to modify any anchor points.  Alternatively, you can just choose the Direct Selection Tool from the toolbox. It's under the Path Selection Tool.

In that fashion, shapes are infinitely adjustable.