A Garage Door for my birthday!!

I got a Garage Door for my birthday!!! Yay Yay Yay!!!
So killer excited, this is the one thing that they thought they where not going to be able to get by handover! Normally it takes 6 weeks for the door to arrive and be installed etc. Our fantastic SS got it done in 3!
I sent him a txt message
"A garage door for my birthday, you shouldn't have. Thanks"
he replied
"You owe me big time"

Since the door is up however all I can show you is this. If I pull that cord with the ball hanging down will the door come down? or will it damage it? do I have to let it sit in place for a little while before playing with it?