Hi Sam! No that's not it, I still have that one that came with my 1600MM. The part i'm talking about has a short length of 1 1/4" tubing affixed to a larger flat, round piece that screws onto the 1600MM attachment point. As I just said, it screws into the threaded round platform on the 1600. The other end slides into a 1 1/4" eyepiece holder. I can't post a picture because its all smashed up. Without this, the 1600MM can't be fitted to a 1 1/4" eyepiece holder. Small but critical if you really want to use the 1600 in a 1 1/4" eyepiece holder, like I do! Silly little thing but critical for this purpose. Thanks for the attention, Sam!