I have one that looks exactly like that, but it's not Ikea.. it says areolatte on the side. I guess that means it makes coffee fly or something! (grin)
A neighbor had a garage sale and I bought it for a quarter.
I clipped the wire at the bottom where the center wire makes a right angle out to the circle. So now the wire is straight down to the tip where it makes a 90 degree turn and that little nib is exactly 1/8" long. I tried it longer, but it made more action than I wanted in smaller bottles, so I kept trimming it and 1/8" was perfect. It's fast, but slow enough I can move it up and down for good mixing in any size bottle, and I can guide the little nub around in the corners.
As it turns out, I like using it.. but I doubt I would have sent away for it. For a quarter on a less than thrilling saturday morning, it was a fun find. And it still has the batteries that came in it.
If it breaks, I'll probably go back to Gerald's methods!