I have an old 2006 A1181 Macbook and I'm having a problem putting a disc through the plastic slot into the optical drive. What is the technical term for it? My guess is some soft of dust proof mechanism. Anyway, it doesn't want to let me smoothly insert a disc into the optical drive. Once I place a disc into the opening, its very stiff. I can go ahead and apply a little force and it does slide in but not in the normal way. I took the optical drive out and it slides in normally. It also doesn't eject all the way out. Is it okay if the dust proof material is taken out? Is there any easy way to get it out? Thanks.