Originally Posted by the sci guy

Thanks for this - I watched a video on youtube on how to remove it once you had identified it. Looks like its time to buy some chainwhips.
And yes you are correct, the bike is a '86 or '87 Cilo with all Shimano 600 components. I spent the last day taking almost everything off (with the exception of the things in this thread) and checking the date codes. More info in this thread on the bike in C&V if you're interested or have any other things to add for me: Late 80's Cilo - seeking info & input