tasco 999vr Old 999VR Tasco won’t focus

[Ameera]

I’ve had this telescope for years. Used it as an astronomy educator during my undergrad. It was always a hit with the kids, showing them the moon. For the last few months, however, the moon is blurry. The coarse adjustment knob focuses it some, but not enough. I don’t know what I’m doing wrong. I don’t think I’m doing anything different than before. I have the diagonal in and the eyepiece in that, and I don’t know what else to do. Somehow, however, putting my phone camera over the eyepiece provided a clearer image in my phone. What do I do? I hope I can fix it…