man, i've been banging on that top through bolt all morning and it's not coming off. i dont know how yours slid out so easily. mine is also a 2017. that bolt is seized up tight
They're tough! Use some anti-seize or WD-40 and a vise and it will come out. If you're not using a vise I'm not sure you'll get it (I tried many different things before going to Home Depot and getting a $40 vise and mounting on my bench lol).
