Timeline:

Preparation:
Use the lowest power setting on the laser and gradually increase it until there's some action [00:41].

Filling the Split:
Use silver wire to fill the split [00:54].
Ensure the wire is in contact with the cuff link. Aim the laser at the silver wire, melting it into the split [01:02].

Addressing Stubborn Metal:
If the metal is stubborn, use a magic flux pen [01:45].

Working with Unknown Metals:
When working with unknown metals, aim for the wire and melt it onto the cuff link first [02:15].