Hi. I need a folding propeller system to my brushed 600 electric motor, but i cant find it anywhere. I tryed in towerhobbies, ebay, etc.

I've seen in a video a real nice folding propeller system using standard propellers secured by a rubber, this way it wount break when hit the ground. Can you tell me where can i buy it?
Since im in portugal i'm limited to some stores. I can buy on towerhobbies, or ebay, but i dont have a local store here
Please, tell me also what propeller should i buy to a 600 motor. This motor is used as a support for a sailplane. Thanks.