bendiddley

Thanks. How do I work out where the exact spot is to glue it back on?

Thanks. When you say "you'd have to reassemble the telescope well enough so that it can still be collimated" do you mean the process which symmetal is saying in his comment... "The front corrector plate can be removed by inserting a tool in the two holes on opposite sides of the corrector plate surround and unscrewing counterclockwise. Make a note of the corrector plate orientation with respect to the tube by marking the edge with a permanent marker or similar."?

Just received a second hand Meade ETX 90 and what I think is possibly the secondary mirror?? has just dropped off when I turned it upside down and is now resting on top of the primary mirror. See photos. Can anyone please tell me what part has fallen off and how I can fix this? Cheers.