[Latitude 28]

Same for us, Delta all the way in our homes we have built.  To remove the handles the very top is like a cap with internal spring tabs going down into the handle.  There should be a very faint seam between the cap and handle that you can slide a thin putty knife between the two and gently pry upward.  

Steve

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Picture as to the faint seam I was talking about.....

Steve