Inquiring the shop where you bought the thumb hook would be recommended if you are worried to attach or remove it on your own. Otherwise, the screw may get damaged and the saxophone body may get scratched.
To Yanagisawa soprano users
It has been reported that this type II hook hits the side F# key of part of the Yanagisawa soprano saxophones that were recently produced. We would recommend not to attach this product on the Yanagisawa soprano saxophones. We apologize to you for this inconvenience.