The glider's flight controls need final rigging/adjustments.

First photo shows that the left and right spoilers are extended the same amount, which is the desired condition.

But we need to check and ensure that they also lock (into the over center position) identically.

Second photo shows the view of one of the spoiler drive arms, as seen through an inspection port. I have added black marks to show when the arm is in the over center position.

How do I adjust the action/throw of the spoilers to ensure they are synchronized? By adjusting the length of push-pull tubes, such as the one I'm pointing to in the third photo.

Now that the spoilers are adjusted, I need to do similar checks and adjustments of the flaperons.

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