Hangar 9 Composite QQ Yak-54 2.6m Instruction Manual page 19

aileron serVo tray installation •
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Following the same method, fiberglass the servo tray piece to the tray bracket.
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Thoroughly scuff the tray and the hatch for this step as it is a very important
part of this process. .
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Use acetone and clean the hatch.
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