Correct me if i'm wrong here as i have not suprisingly never heard of these actions before. But the screw grip and PHV1 are where the top lever has an extesion that goes into a greener crossbolt or dolls head and cams the barrels down, right? And for these actions when you close the barrels you have to turn the top lever not as where in most doubles where when you close the barrels the lever goes to the locked position?

PS: I searched the forums and when the following actions were defined they weren't clear to me.