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In my experience, you do not need to buy that tool.
I have used a set of needle-nosed pliers -- expanded all the way to ends of the slot on the caliper piston -- to rotate and retract the piston into the caliper.
It's a little awkward at first; you may need to insert a crescent wrench across the hinge of the pliers to get extra rotation leverage.
But it works and it certainly beats spending money on yet another tool to store.
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