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I assume you are talking about the control retaining nut that has two notches in it? I just use a pair of needle nose pliers usually. Years ago I ground down a deep socket to fit the grooves in the nut and it worked well but that has long since disappeared.  You might be able to use a pair of retaining ring pliers but you may break the tips depending how tight the nut is. They do make tools to remove them but they are hard to find and are basically a socket with two tabs on it.