DRK-1 Dark Eye Probe

[kresty]

That's about what I was guessing just from the video - "softball size" is what I was thinking - which looking up on the 'net seems to have a circumference of 12" (why do they specify circumference?) So about 3.8" diameter. So I guess we're in the same ballpark.

It's hard to get excited about the Wookiepedia entry without a source, and, as you mentioned, they didn't say what bit was being measured. Interesting, they link to the IM droid in Tokyo Star Tours - that one's clearly similar, but the "skid/fingers" on the lower sides differ. (I mean, lots of stuff differs, but those look like they should've been the same as the CG DRK1 model.)