Gather your materials! 

 Cut a piece of string about 1½ feet in length. 

Insert the handle of the dreidel into a hole on the ruler. 

Then, begin winding the string around the handle. Continue winding until there’s about 4 inches left. 

Hold the ruler in one hand and the end of the string in the other a little bit above the floor. 

Pull the string, let the dreidel drop to the floor, and watch it spin!