Resize Slider question

I am in the process of designing a tile. I am wondering how people reduce the height of the slider.

You can’t change the height of the Slider track but you can change the height of the Thumb if you supply a custom image. The custom Thumb will not display during design time. You’ll only see it in the simulator & in the actual apps.
CustomSliderThumb.hrp (96.9 KB)

I am really puzzled on this. I can never get the ball part of the slider to fully show on the tile. I am attempting to modify the HSdevice tile. Any help is greatly appreciated