Wasn't able to find part 6106472, Ball Cup High Friction W. Rubber (older number appears to be 74261 - Hero Factory Arm / Leg Extender with Ball Joint and Ball Socket). Was a bit hard trying to find, but 6106472 is the part ID in the build instructions I have for General Grievous. The older part number, 74261, is available in LDDs Digital Designer Extended.
Anyone willing to take this one on...???

At Digital-Bricks there are a number of the
figure parts, exported from LDD.
Among them is also the
part you require
But note, if this is done by a part author, the origin might change, although in my opinion the origin is pretty good.
So in the meantime you could use this part.
Origin is good indeed (though placing it in the middle of the ball would not be stupid either), but orientation doesn't match other similar parts. Better use attached version, 90° rotated around Y.
Gerald Lasser Wrote:At Digital-Bricks there are a number of the figure parts, exported from LDD.
Among them is also the part you require
But note, if this is done by a part author, the origin might change, although in my opinion the origin is pretty good.
So in the meantime you could use this part.
Thanks Gerald! Didn't run across that site in my searches, it's bookmarked now.

Still learning a lot about parts so this will be handy.
Philippe Hurbain Wrote:Origin is good indeed (though placing it in the middle of the ball would not be stupid either), but orientation doesn't match other similar parts. Better use attached version, 90° rotated around Y.
Thanks Philippe. Works like a charm!