Awhile back, when I ordered the jumbo flyer for my spinning wheel, I also ordered an Ashford lazy kate. My Ashford Traveller (see the picture in the sidebar) has a built-in lazy kate on the front of the wheel, but it will only hold the standard size bobbins.
Of course it came unassembled. The assembly wasn't complicated, but it was really hard to put the screws in on the sides. I think I almost had a blister before I got it put together.
But anyway, here it is, ready to ply with some Falkland roving I ordered from Fat Cat Knits on Etsy. There were four ounces all together, with about two on each bobbin.
I haven't tried it out yet...I'll have to let you know how it works.