Mark the spot where the thumbtack rested, then drill a hole into that spot. “If you don’t have a drill, you could just tie the string around the dowel at that spot, but there’s a chance it’ll slip to one side or the other,” Spencer cautions. “That’s initially how I left the first one that I made for my parents. But it ended up that the wind blew it over, because it wasn’t fastened securely through a hole.”