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i have been reading about balancing and have an idea how to do it i just have a question about when you have to screw in the l/shield valve on the rad that gets hottest first . on my system , this would be the one in the bathroom that has two l/shield valves on as there is no trv on it , so would i screw both ends of this rad in a little ? or am i mistaken and there is only one l/shield per each rad always ? thanks