HOW TO MAKE A JIG
I used an old bookshelf to make my jig, but any solid wood surface works well.
Pressed wood will not hold the nails securely.
Mark the nail placement on the wooden board.
The length of your necklace will be equal to the distance between the two nails you’ll set into the board. Use a ruler to measure the desired length of your necklace on the board, and use a permanent marker to mark the position of each nail. For my necklace, I made marks that are 15 in. (38.1 cm) apart.
Drill the nail holes.
You’ll be setting the nails in the board at an angle, which is difficult to do with a hammer. Using a drill to make pilot holes for the nails is a good solution. Set the tip of your drill bit on the left mark, and angle the bit approximately 60° to the left. Drill into the board just deep enough that the nail will fit snugly. Repeat on the right mark, angling the bit 60° to the right.