No, this is entirely new.  The shoulders have been solid on this ever since the original Fire Valk release, I think, which uses the same shoulder design. I just messed with my older "beater" YF-19 that I transform and mess with all the time, and no, the screws to directly loosen that joint aren't reachable, even after transforming it.  They're covered by the shoulder pauldrons, and I'm not sure how those can be removed.  They're all glued shut. The best option looks like it would be to