Just got my FS Predator set-up. In my excitement to get going I may have put the diopter lenses in upside down. I thought the strength indicator tab was supposed to go down. When I inserted them, they went in very hard - I know- that should have been a hint... Anyway, they're in they seem to work, but they don't want to come out. Has anyone else done this? If so, how have you gotten them out?