This solution also works on the 2017 Hyundai Tucson. I absolutely could not figure out how to separate the boot from the knob, but assumed Hyundai models would use similar parts. This video did the trick. I believe the same process will work on all Tucson models from 2013-2018
This video shows how to do it in my car, it may not be the same for yours, best of luck ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-62pNeVfKVvo.html