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The IDS from Servorahmen are starting to show issues from wear in the molds. I guess this is a good thing as it indicates that they are selling real well. With low profile servos like the KST X0-8 there is little clearance between the base circle of the drive arm and the skin. Any protrusion on this base circle will distort the wing skin. Much like the improperly fitted X arm I show earlier.
Prior to glueing down the tray make sure there is clearance between the drive arm and the wing skin. I file off these bumps prior to fitting the arm on the servo.
balsa is used with in the layups and the wings are not as stiff as from other factorys made at this time. I have a wing from build ~2015 and had this top wing surface issue only on one position of the servo. the material choice of balsa is a good suspect here. a carbon cloth is on the cutout of...