davey_flyer,

On most planes, crossing the pull-pull lines will give you a straighter shot at the horns. They need to be fairly tight, almost like a guitar string. Check them after each flight early on as they usually loosen up a bit and will need to be re-tightened. If this is on your Wildhare you probably should cross them, I just recently finished mine but waiting for spring to get it air-born. Feel free to PM me if you have any other questions with this build, I'd be glad to tell you what I've learned about it so far.