Scuff the top of your hardhat with the provided sandpaper, and then wipe it off with the alcohol wipe to remove any trace oils. This will make the mount adhere better to your hardhat.
Apply double-sided sticky tape to the bottom of the metal washer.
Attach the metal washer to the top of the hardhat surface that you cleaned off in step 1. Let the double-sided sticky dry completely, if possible, for up to 30 minutes.
Fit the teeth between the cradle and the magnet mount together, securing the two with the provided screw.
Place the camera into the cradle, fitting the grooves on the side of the camera into the teeth.
You're done! You can place the entire camera + mount on the metal washer on top of your hardhat, take a capture and then remove it without taking off your helmet.