Cone Glyph with varying radius but constant height?

I have some vector data, where I want to visualize direction and magnitude by a cone. Basically, the direction shall be the direction of the cone and the radius of the cone shall be reflected by the magnitude.

However, when I apply a glyph filter, set it to cone and use Direction and Magnitude, the cone itself is scaled by the magnitude, not just the radius.

Here is an example: demo.vtk (265 Bytes)

The cone center is set to [-0.5, 0, 0], height is 1 and radius is 0.5. As you can see, the shape stays the same (with aspect ratio 1:1) and the cones are scaled by the given scalar.

Is there any quick way to simply scale the radius?