Materials: a balloon and an air pump.
Inflate a balloon with a four—inch flat tail (Pic 1).
Twist the first two—inch bubble (Pic 2).
Twist the second two—inch bubble (Pic 3).
Twist the third two—inch bubble (Pic 4).
Lock both ends of the chain of the three bubbles in one lock twist (Pic 5). This step is marked with arrows between points A and B on the scheme.
Twist the fourth four—inch bubble (Pic 6).
Twist the fifth soft one—inch bubble (Pic 7).
Lock both ends of the fifth bubble in one lock twist (Pic 8). This step is marked with arrows between points C and D on the scheme. The fifth bubble keeps the fourth bubble in a fixed position.
Twist the seventh one—inch bubble at the end of the sixth bubble. There is a two—inch flat tail at the end of the balloon (Pic 9).
Lock both ends of the sixth bubble in one lock twist (Pic 10). This step is marked with arrows between point D and F on the scheme.
Pump the seventh bubble to the end of the flat tail, so the flat part stays between the sixth and seventh balloons (Pic 11).
Find the middle of the sixth bubble and stretch the seventh bubble to this point (Pic 12).
Lock the free end of seventh bubble around this point splitting the sixth bubble on two parts (Pic 13 and 14). This step is marked with arrows between point E and G on the scheme. Congratulations, you have made the guitar. Have fun and happy twisting :)