The frame is weak in places and needs some bracing when using the CCPM option to hold the servo tray from flexing.
These arrangements eliminate the play on the cyclic/collective controls and gives a more rigid frame.

Solution 1 by CK_ Solution 2 by d-n-jensen Solution 3 by Dominic Girard
Braces under the radio tray, it's homepage is at:
Tray Flex solution Picture
by John, website

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