I have a NiMh kit and when I use the servo horn included there is not enough clearance for the ball joint and I am sure that the LiPo kit has a servo horn that is taller. I have looked up the U3310 part and it looks as it is the same part that I already have. If you look at page 27 you can see the size of the NiMh horn and the ball joint points outwards and on page 30 you can see that the ball joint points towards the servo and the two pages show the horns as different sizes.
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