I've got the Laguna Cyclone noted in the subject line.
It has a small handle on the outside filter that you turn, and a sprocket turns inside the filter, which in turn removes fine dust from inside the filter.
I got this DC a new, a few years ago.
I called Laguna, and they no longer support this model.
Anyone have any ideas where I might get a new sprocket like that? It's kind of a "corner sprocket "....not sure what to call it.
I'll take some pix when I'm at my shop, and upload them here.....