Object bind, rigid body - sliding

[ldotchopz]

Sorry to spam with yet more noob questions.

I'm trying to get my head around actor rigid bodies and physX binds by making a tail wag effect.

I has been successful although i cannot get it to stay bound with the rotating sphere. It should stay where the green point is but it slides in and out of the sphere.

I feel i may have gone wrong somwhere in this setup.

any help would be appreciated!