diff --git a/qglengine/core/glprimitives.cpp b/qglengine/core/glprimitives.cpp
index 4b1ea63..fcbaa0b 100644
--- a/qglengine/core/glprimitives.cpp
+++ b/qglengine/core/glprimitives.cpp
@@ -265,7 +265,7 @@ Mesh * Primitive::cylinder(int segments, float radius, float height, float end_a
 
 Mesh * Primitive::arrow(int segments, float thick, float angle) {
 	double cone_r = 1.5 * thick;
-	double cone_h = 1.5 * cone_r / tan(angle * deg2rad);
+	double cone_h = 2. * cone_r / tan(angle * deg2rad);
 	Mesh * ret = new Mesh();
 	Mesh * m = Primitive::cylinder(segments, thick / 2., 1. - cone_h);
 	ret->append(m);
diff --git a/qglengine/renderer_service.cpp b/qglengine/renderer_service.cpp
index 40b0ab3..3011095 100644
--- a/qglengine/renderer_service.cpp
+++ b/qglengine/renderer_service.cpp
@@ -91,7 +91,7 @@ RendererService::RendererService(Renderer * r_): r(r_) {
 	handle_rotate_mesh->append(m);
 	delete m;
 
-	handle_scale_mesh = Primitive::cylinder(12, 0.06, 0.85);
+	handle_scale_mesh = Primitive::cylinder(12, 0.03, 0.85);
 	m = Primitive::ellipsoid(12, 12, 0.15);
 	m->translatePoints(QVector3D(0., 0., 0.85));
 	handle_scale_mesh->append(m);