The retaining screws are the same all the way from the Classic on up. It could be more of a frame issue. You could take off the black panel on the non-LCD side to see if the screw is actually going straight through the frame. Otherwise a little blue loctite should be able to hold it in. I'm assuming you've already seen it, but the GZ guide at PettyPB.com compares the new triggers with the old.