[Solved] Changing mesh of child gameobject

Hello,

I want to change the mesh of a gameobject which is the child of another gameobject. I locate the mesh, copy it, change it, clear the old mesh and replace it, as described in the script reference but the changes don't seem to take effect.

Is it because it's a child object? Here's my code briefly, I feel like it should work:

 Transform parentTransform;
 Transform childTransform;
 Mesh mesh;
 Vector3[] vertices;
 Vector3 vert;
 Vector2[] uv;
 int[] triangles;
 ...
 childTransform = parentTransform.Find(childname)
 mesh = childTransform.gameObject.GetComponent<MeshFilter>().mesh;
 vertices = mesh.vertices;
 uv = mesh.uv;
 triangles = mesh.triangles;
 vert = vertices[0];
 vert.y += 5; // Change y of a single vert
 vertices[0] = vert;
 mesh.Clear(); // Clear old mesh
 mesh.vertices = vertices; // Assign new vertices with that one altered point
 mesh.uv = uv;
 mesh.triangles = triangles;
 childTransform.gameObject.GetComponent<MeshFilter>().mesh = mesh; // Not sure if necessary