For those using the stock Behotec main struts...
The lower section is hollow and has a weak area - see red circle below. The strut can bend here & cause binding, preventing it from sliding in & out smoothly. Inserting a piece of 6mm dowel stock eliminates this weak point. I've been using this mod for the past couple months off rough grass, including a few hard landings. I have not had any problems or issues.