How to control Gandalf "flying bricks"?

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I'm having a heck of a time trying to stack the bricks together using Gandalf's brick levitation ability.
It seems nearly impossible to move them a single stud left/right/back/forward.
I'm running on Windows 7, with keyboard controls.
Is there a way to do this well?
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LOTR Meme | Gandalf goes balistic on the Shire
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