I am building a telescope for my seinor project at my high school (required to graduate!). I am building a 10" dobsonian with a 12 inch sonotube telescope tube (Inside Diameter). I have every part I need except a mirror cell. I need it in somewhat good condition. I am on a tight budget but I will listen to a reasonable offer. contact me at to get ahold of me. I am on a limited time schedule, so time is of the essence. Thanks a lot!