i've stated this in other posts, i have a 7897. yes, if you install the unit all the way in, the face will get hung up on that lip. i was gonna file but afraid it might look horrible when the face was retracted. so i just installed the install sleeve slightly out (as in, not all the way in

). that gave the face plenty of room to extend out all the way and not get hung up. looks great, you can however see the install sleeve a little bit (and i mean just a little) when the face is retracted.