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I have a weird 'frying' sound in the bottom of a 3rd floor radiator, so I'm guessing I need to tilt it more toward the valve (the pitch is currently about 2 degrees). What is the best device/technique to raise the vent end of this radiator that is recessed into a wall alcove such that there is only about 5" clearance on either side and back? I'm leery of using a bar to leverage it, for fear of compromising a joint or connection.