Good day! New member here and nice to meet you all

First of all please pardon me if this question has been asked millions of time. I've been searching thru multiple forums but to no avail.
I am trying to detach the deployant clasp (it is the newer version, one the closes from 2 sides) from my Leman Flyback Chrono Grande Date. I saw there are two "screw heads" at the buckle end. So I believe I simply unscrew them to detach the clasp. But no, whenever I unscrew one side the other side will turn/spin also. Am I doing something wrong? Or I need to use two screw drivers on both ends at the same time?
Many thanks in advance.