Still available on weston's website. Weston 11 lb Vertical Sausage Stuffer part number 86-1101-W for $7.16
Just wanted to post a quick update to this thread.
I've had the Northern Tools stuffer for a couple of years now. It has stuffed a lot of sausage with no problems.
I would highly recommend a stuffer from Northern Tools. BTW I have an electric meat grinder from them that I have also been using with no problems.
Would the solid red o-ring not fit the Weston stuffer? I also have one one of those lipped ones, so far no problems, but would like to have a spare handy.