Answer:
1.Attach the spindles to the wooden board or cardboard using nails as shown in the figure
2.Take the small cardboard box and tie two strings to the top and one to the bottom. This is your elevator car.
3.Pass the bottom string from the box over spindles 3,4, 2, and 1 (make sure to loop the string at least twice over spindle 2) and tie it to the first string on the top of the box.
4.Pass the other string from the top of the box over reels 5 and 6 and attach it to a counterweight of about 100 gms.
5.Turn the spool 2 with your fingers. The elevator car should move up and down depending on the direction of your rotation of the spool.