diff --git a/phases/full_polarization.py b/phases/full_polarization.py
index 48e1b96..f0d8ba8 100644
--- a/phases/full_polarization.py
+++ b/phases/full_polarization.py
@@ -131,24 +131,42 @@ class UndRadial(UndShiftRadialBase):
 
 class UndShiftQuadrants(Adjustable):
 
-    def __init__(self, ID, accuracy=0.001):
+
+    def __init__(self, ID, which, accuracy=0.001):
         ID += "SHIFT"
-        super().__init__(ID)
-        names = ["TL", "BL", "TR", "BR"]
+
+        which = which.upper()
+
+        opposites = {
+            "TL": "BR",
+            "BL": "TR"
+        }
+
+        inverted_opposites = {v: k for k, v in opposites.items()}
+        opposites.update(inverted_opposites)
+        all_names = opposites.keys()
+        opposite = opposites[which]
+
+        self.names = names = [which, opposite]
+        for n in all_names:
+            if n not in names:
+                names.append(n)
+
         pvnames = [f"{ID}-{n}" for n in names]
         adjs = {n.lower(): PVAdjustable(pvn + "-SET", pvn, accuracy=accuracy) for n, pvn in zip(names, pvnames)}
         self.adjs = SimpleDevice(ID, **adjs)
 
+        self.which_adj = which_adj = adjs[which.lower()]
+        super().__init__(F"{ID}-{which}", units=which_adj.units)
+
         self.pv_on = PV(ID + "-ON")
         self.pv_go = PV(ID + "-GO")
 
 
     def set_target_value(self, value):
-        tl = value
-        br = -tl
-        bl = tr = bl = 0
-        vals = (tl, bl, tr, br)
-        tasks = [a.set_target_value(v) for a, v in zip(self.adjs, vals)]
+        names = (n.lower() for n in self.names)
+        vals = (value, -value, 0, 0)
+        tasks = [adjs[n].set_target_value(v) for n, v in zip(names, vals)]
 
         sleep(0.3)
         self.pv_on.put(1)
@@ -160,7 +178,7 @@ class UndShiftQuadrants(Adjustable):
 
 
     def get_current_value(self):
-        return self.adjs.tl.get_current_value()
+        return self.which_adj.get_current_value()
 
     def is_moving(self):
         return any(a.is_moving() for a in self.adjs)