Open Peerless 710 or 510 with not key !!!

To open the peerless 710 or 510 with double lock actived it is enough to strike the handcuffs some things of hard in the dirrection opposing to the double lock and the handcuffs will not be double lock any more lock then with a shim open the handcuffs .
I have a pair of peerless model 710 (With MEDECO) and this functions very well .