Sounds about right, it's basically a metal pole in a shaft being added to the trem, and while this doesn't affect trem use (pull ups and dives) it will "deaden" flutter, as the trem is no longer a spring only system (ie, the flutter is the springs fluttering). ALthough, as kev says later on (yes, this is an edit), if it is properly aligned, this shouldn't be an issue
