Cord Management Device Development

I need a compact mechanical device designed for cord or cable management. The device should store and retract a long, flexible line (10-30 meters). It should be able to be pulled out under tension and temporarily locked at various lengths with a manual lock. Additionally, it should automatically retract when the lock is released.

Key Requirements:
- Stores and retracts 10-30 meters of flexible line
- Can be pulled out under tension
- Temporarily locks at various lengths with a manual lock
- Automatically retracts when lock is released
- Compact and durable design

Ideal Skills and Experience:
- Mechanical engineering
- Experience with locking mechanisms
- Prototyping and product development
- Familiarity with cord or cable management solutions

Looking forward to your innovative solutions!