Requiem: Help Stuck in level 7 (the Engine)

[datorskarm]

Hi,

I'm stuck at the end of level 7. I have gotten all keys, but the red laser beams remain on, so I cant go through portal :-(
Saw in an earlier post that beams could be turned off by going through a vent in the last "pistons room"...However the only turnable thing there, right now, for me is the wheel for the steam!!??
There is also a slide door but it cant be opened. (Not even a hand icon when moved over)

Also I can't get the "blue ball" to go more than two steps in the "path of sloped cylinders" (Have applied both handles in empty slot).
Could this fact have anything to do with not beeing able to turn off tha final lasers?

-Thanks in advance !

//Datorskarm