Step 4Make the groove
Take another key with a groove in it, it doesn't have to be the original, we are going to use the groove in it to create our groove in the copy.
Now line the groove up with your printout and force a groove into your new copy using a ruler or something thin and blunt. Press the ruler down and whilst holding it down flatten the sides which will now be sticking up in a V shape. See the pictures for detail.
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Sorry, couldn't help it. :)