We've discovered a trick you can use to improve the longevity of the L-39's control surfaces. Please refer to the tech notice file below for information.
On page 6, step 1 of the manual, the drill bit size used to enlarge the outer holes of the aileron servo arms should be a #58 [1.06mm]. A 3/64" [1.2mm] drill bit could also be used but would result in a slightly loose fit of the aileron pushrods in the servo arms.
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