diff --git a/src/build123d/objects_curve.py b/src/build123d/objects_curve.py
index 633cad3..3a34085 100644
--- a/src/build123d/objects_curve.py
+++ b/src/build123d/objects_curve.py
@@ -207,6 +207,9 @@ class DoubleTangentArc(BaseEdgeObject):
         context: BuildLine | None = BuildLine._get_context(self)
         validate_inputs(context, self)
 
+        if keep not in [Keep.TOP, Keep.BOTTOM]:
+            raise ValueError(f"Only the TOP or BOTTOM options are supported not {keep}")
+
         arc_pt = WorkplaneList.localize(pnt)
         arc_tangent = WorkplaneList.localize(tangent).normalized()
         if WorkplaneList._get_context() is not None:
@@ -269,7 +272,7 @@ class DoubleTangentArc(BaseEdgeObject):
                 _, p1, _ = other.distance_to_with_closest_points(center)
                 TangentArc(arc_pt, p1, tangent=arc_tangent)
 
-        super().__init__(double.wire(), mode=mode)
+        super().__init__(double.edge(), mode=mode)
 
 
 class EllipticalStartArc(BaseEdgeObject):
@@ -719,7 +722,7 @@ class PolarLine(BaseEdgeObject):
         start (VectorLike): start point
         length (float): line length
         angle (float, optional): angle from the local x-axis
-        direction (VectorLike, optional): vector direction to determine angle        
+        direction (VectorLike, optional): vector direction to determine angle
         length_mode (LengthMode, optional): how length defines the line.
             Defaults to LengthMode.DIAGONAL
         mode (Mode, optional): combination mode. Defaults to Mode.ADD
@@ -863,7 +866,7 @@ class RadiusArc(BaseEdgeObject):
         else:
             arc = SagittaArc(start, end, -sagitta, mode=Mode.PRIVATE)
 
-        super().__init__(arc, mode=mode)
+        super().__init__(arc.edge(), mode=mode)
 
 
 class SagittaArc(BaseEdgeObject):
@@ -907,7 +910,7 @@ class SagittaArc(BaseEdgeObject):
         sag_point = mid_point + sagitta_vector
 
         arc = ThreePointArc(start, sag_point, end, mode=Mode.PRIVATE)
-        super().__init__(arc, mode=mode)
+        super().__init__(arc.edge(), mode=mode)
 
 
 class Spline(BaseEdgeObject):
diff --git a/tests/test_build_line.py b/tests/test_build_line.py
index d37e101..94f7766 100644
--- a/tests/test_build_line.py
+++ b/tests/test_build_line.py
@@ -134,14 +134,16 @@ class BuildLineTests(unittest.TestCase):
             tuple(l5.tangent_at(p1)), tuple(l6.tangent_at(p2) * -1), 5
         )
 
-        l7 = Spline((15, 5), (5, 0), (15, -5), tangents=[(-1, 0), (1, 0)])
-        l8 = DoubleTangentArc((0, 0, 0), (1, 0, 0), l7, keep=Keep.BOTH)
-        self.assertEqual(len(l8.edges()), 2)
+        # l7 = Spline((15, 5), (5, 0), (15, -5), tangents=[(-1, 0), (1, 0)])
+        # l8 = DoubleTangentArc((0, 0, 0), (1, 0, 0), l7, keep=Keep.BOTH)
+        # self.assertEqual(len(l8.edges()), 2)
 
         l9 = EllipticalCenterArc((15, 0), 10, 5, start_angle=90, end_angle=270)
-        l10 = DoubleTangentArc((0, 0, 0), (1, 0, 0), l9, keep=Keep.BOTH)
-        self.assertEqual(len(l10.edges()), 2)
-        self.assertTrue(isinstance(l10, Edge))
+        # l10 = DoubleTangentArc((0, 0, 0), (1, 0, 0), l9, keep=Keep.BOTH)
+        # self.assertEqual(len(l10.edges()), 2)
+        # self.assertTrue(isinstance(l10, Edge))
+        with self.assertRaises(ValueError):
+            l10 = DoubleTangentArc((0, 0, 0), (1, 0, 0), l9, keep=Keep.BOTH)
 
         with self.assertRaises(ValueError):
             DoubleTangentArc((0, 0, 0), (0, 0, 1), l9)
@@ -269,13 +271,17 @@ class BuildLineTests(unittest.TestCase):
 
         with BuildLine():
             a4 = PolarLine((0, 0), 1, angle=30, length_mode=LengthMode.HORIZONTAL)
-            d4 = PolarLine((0, 0), 1, direction=(sqrt(3), 1), length_mode=LengthMode.HORIZONTAL)
+            d4 = PolarLine(
+                (0, 0), 1, direction=(sqrt(3), 1), length_mode=LengthMode.HORIZONTAL
+            )
         self.assertTupleAlmostEquals((a4 @ 1).to_tuple(), (1, 1 / sqrt(3), 0), 5)
         self.assertTupleAlmostEquals((a4 @ 1).to_tuple(), (d4 @ 1).to_tuple(), 5)
 
         with BuildLine(Plane.XZ):
             a5 = PolarLine((0, 0), 1, angle=30, length_mode=LengthMode.VERTICAL)
-            d5 = PolarLine((0, 0), 1, direction=(sqrt(3), 1), length_mode=LengthMode.VERTICAL)
+            d5 = PolarLine(
+                (0, 0), 1, direction=(sqrt(3), 1), length_mode=LengthMode.VERTICAL
+            )
         self.assertTupleAlmostEquals((a5 @ 1).to_tuple(), (sqrt(3), 0, 1), 5)
         self.assertTupleAlmostEquals((a5 @ 1).to_tuple(), (d5 @ 1).to_tuple(), 5)