First, remove wing, then set (bend the rear gear to where it looks as straight as possible. Then, change the nose gear from as steerable as possible to the least steerable .It doesn't take much movement to turn a plane on the ground. Make sure it's straight buy finding a slop, (sidewalk or something) and give it a coast test. When it look's like it will track straight then go to the field (wing off) and taxi test it. When its all groovy make sure the rudder is straight by adjusting the linkage. Leave the front wheel alone after its tracking good. And remember after a hard landing it may be tweaked a bit. No prob , just bend it back and test it out again.