I have a flip mirror system 1 1/4 inch for sale. Only used once since new. I don't have an extension tube so can't get focus plus I don't use it.
Flip mirror up for CCD/DSLR, flip mirror down to let light pass through to the eyepiece. Also has camera thread aswell. Great to find objects when imaging instead of changing from CCD/DSLR to eyepiece all the time.