diff --git a/MachineTool/DemoBuildMachineTool.cs b/MachineTool/DemoBuildMachineTool.cs
index a95e53a..5ed259c 100644
--- a/MachineTool/DemoBuildMachineTool.cs
+++ b/MachineTool/DemoBuildMachineTool.cs
@@ -54,7 +54,7 @@ namespace Sample.MachineTool
                 ["S"] = new Solid(new Stl("MachineTool/spindle.stl")),
             };
             chain.AnchorToSolid.BuildAnchorToSolid(
-                chain.Asmb.GetDescendantAnchors(), solidMap);
+                chain.Asmb.DescendantAnchors(), solidMap);
 
             GeneralXyzabcMachineTool dst = new GeneralXyzabcMachineTool(chain);
             dst.GenerateCollisionIndexPairs();