Thread: CDS dial for Leupold scope

Hello - when I bought a new Leupold scope a few years ago, I was given the opportunity to have a free CDS dial made for the rifle and the calibre I generally hunt with. However, the dial went missing in my workshop under the house before I could install it. Recent renovations in the workshop have led to the dial's rediscovery, but I can now neither remember how it works nor how it needs to be put on the scope. Does someone out there have any experience they could impart?