How to cut space for keyhole hanger without a router?

How to cut space for keyhole hanger without a router? keyhole slot hanger Keyhole Slot Mounting Instructions How to Hang something with Keyhole Slots Keyhole keyhole slot plug Here's a quick vid of this pair of keyhole hangers I made out of some washers If you need some

keyhole slot plug Keyhole Slot Hanging Instructions 62K views · 7 years agomore Drakestone Designs 200

keyhole slot hanger Both the indoor unit and outdoor sensors feature keyhole slots and Built-in hanger for easy and secure mounting What We Don't Like  Keyhole Slot Mounting Instructions How to Hang something with Keyhole Slots Keyhole