I still stand behind my statement of getting the eyes checked (what could it hurt?). As far as the Tower trainer, there is a reason it's so cheap, I know, I own one! Yes it flies, yes you can learn on it, but from seeing a NexStar up close, the Tower trainer isn't half the plane. Spend the money on new parts for the NexStar if yours isn't fixable. You won't regret it.