Problem with slider

Hi Everyone, I made a simple slider (horizontal) where you drag to four different points and it shows my layers that have images and text.  The problem is, the slider button (and action) is so poor.  It will work - if you try really hard and grab the button in exactly the right spot.  Is there some setting somewhere that defines the size of the "grab" area to pull the slider across?  Any help is greatly appreciated! 

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