I went to YouTube and found a video of changing from a 1300/1400 Delta value to a 17 series value. In watching the video they had to replace the temperature control handle once the value was replaced. All they did was to 'snap' the handle in place. I decided if they only 'snapped' it in place, then it must just 'snap/pull' off and it did. After that the temperature adjustment was a piece of cake!