Phill, the old NACRAs I had with screwed on traveler track all had holes in other side of aluminum beam so you could fit a nut driver through the beam to hold the nuts for mounting traveler bar to top side. That way you didn't have to guess where the nut was with this batten idea of yours. I guess the loss of strength in a beam due to some small diameter holes in it is worth the ease of assmebly?<br><br>