11 Using the template, trace numerals onto the white tiles and draw on with a permanent marker.
12 Insert two screw eyes into the plain, flat side of the ‘watch’, approximately 14mm (5⁄8in) in from each edge. Repeat for the other side.
13 Drill or melt holes all the way through the sides of the remaining 1×6 bricks, 14mm (5⁄8in) from each end.
14 Tie stretch elastic thread to the two screw eyes on one side of the ‘watch’. Thread on the 1×6 bricks in rainbow order through both lengths of elastic.
16 Pull up the elastic tightly and tie to the two screw eyes on the opposite side of the ‘watch’.
To ensure all the holes in the 1×6 bricks line up, stack them on top of each other and mark each hole with a dot using a ruler to make sure they’re in a straight line.