The Cygnet amphib has three ways to absorb big bumps from uneven terrain and hard landings. The balloon tires provide a great cushioning effect, the torsion axle absorbs bumps, and the bungee shock cord lets the suspension flex even more when it needs to. A stainless steel cable acts as a limiter to prevent the bungee from stretching too far.
The bungee wears out over time, and thankfully it is easy and inexpensive to replace. All you need is 6 feet of 3/8″ diameter bungee cord and two cable ties.
Start the bungee as shown here: 
Hold the bungee in your right hand about 8 inches from one end. With your left hand, start wrapping away from you, keeping tension to slightly stretch the bungee. The goal is 11 wraps for average weights and 12 wraps if typically carrying heavy loads. The bungee suspension should not activate unless absorbing terrain. If the suspension sags while the Cygnet is not even moving, the bungee is worn out or too loose. The bungee is just right when it just starts to stretch when hitting small bumps when the Cygnet is loaded with a normal medium payload. If the bungee suspension is not active when hitting bumps with a normal or heavy load, the bungee is too tight.
When you secure the ends of the bungee with cable ties, make sure the cable ties DO NOT go around the stainless round tube. The stainless tube being able to move is what makes the suspension system in action.
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