Magnetizer wont work

Hi guys.

I have a simple magnetizer setup for getting from street level to my first floor. Its just a magnetizer with a pole of 10 fances above it. This is supposed to catapult me up through a hole in the roof, like a fireman

But it only works like 1 out of 10 times and I dont know why. The magnetizer is of cause powered by copper cable and of cause i am wearing metal boots. At first I thaught the magnetizer needs to recharge but in this case it would take energy from the cable and it does not.

Any Ideas on this

Thanks it worked just fine.