I just wanted to share my success. After hearing from a lot of people it would be very dangerous to do it without any knowledge, I worked uo te courage to do it. I watched a couple of YouTube videos on how to do it, bought the right coils and 3 hours later, the door opens! The hardest part was to coil the springs to the right torsion. Lots of energy on those coils. via /r/DIY http://bit.ly/2Jck0yG
