My wife's MacBook, circa early 2011 needs to be scrapped out. An electronics scrap drive is scheduled next month for my community, but I believe they will only accept this unit if it has no battery in it. I opened the back but to remove the battery, I will need a tri wing screwdriver like you sell. Not sure I need a Y0 or Y1 size. Do not need a new battery or anything else. Can you tell me what size I need?