What you will need:
- 4mm elastic cord
- Plastic Hooks - self-fit for elastic cord
- Cord Locks - 4mm+ double holed
- Cord Toggle Ends
The plastic hooks cost me 50p each, cord locks were 29p each, toggle ends were 20p each and the elastic cost 36p a meter. So for a 1 meter leash your looking at £1.35 - A very cheap solution to what could be a very expensive problem!