Stripping a 90's Schwinn Frontier 26" mountain bike. Does have a bike shop sticker so not from wally world. After pulling the fork, I thought I'd drive out the cups for spares as I'm scrapping the frame. IDK but there is no upper cup and frame is threaded ? Weird, what is going on? Does the top bearing mount upside down from what I'm used to? Why is it threaded? How do I remove it?