For a door on the Grand or Mini that is loose, I went to the craft store (Hobby Lobby, Michaels, Joanns) and got a square of craft felt, cut some 3/8 by 3/4 inch strips and used some double stick tape and taped them inside the REO. One behind the battery and one behind the bottle. Works like a charm, and no sticky stuff on the battery. I used to put electrical tape on the batteries, but the 14500s with tape on them don't fit in my Mini Woodvil. There is enough felt in one $.99 piece to do a hundred REOs. I intended to get some of that craft foam kids cut stuff out of, but it looked a bit too thick.