On the 24th flight of my new HBK2 it suddenly came back at me (tail in) ...I went full forward on the sticks and that did little to slow it down. I moved and cut the throttle as it passed me and luckily got away with little damage, scuffed up tail and main rotors. I found that my front servo was locked in the full up position, you could hear the motor just a spinning away but no movement. I am in the habit now of taking failed servos apart because often they can be fixed at no cost. Flipping a gear around 180 degrees and such.

Well there is a defect with the new esky digital servo EK2-508. There is enough room in the case at the back cover for the motor to slide back and disengage the pinion from the first gear! Thats what happened to mine, for whatever reason the motor loosened and slid back. I made an easy fix for this by simply CA gluing a piece of .060 plastic in the back cover over the motor. Now it cannot do that again, I repeated this with all 4 servos for safety's sake. I know they are cheap servos but I am impressed by how smooth they are for cheap servos LOL! This tip might save you some bux on servos and maybe save you from a bad crash.