I was going to take my DK-2 off my D2H when I sold it, but forgot, so I ordered another, no biggie, right......except, the camera store put the that 1 on my D2H, so I haven't a clue! I've got the original one off, np, but can't figure out the mounting sequence for this new setup. There's the glass eyepiece, the metal ring the original OEM piece of rubber was around, and the DK-2 eyecup. How do they go together? I can't seem to figure it out. Help!