During the course of this procedure, I found a bit of a problem with one of the skins. Unfortunately one of the skins was not the best fit when it came to the Front Spar. The rear spar was fine... I checked whether it was constrained by the cradles or inaccuracy of the bench tops, but it was not caused by either. I eventually found that I could get a fit by starting the clecoing from the middle of the skin and work outwards. The other skin, had no requirement for this at all. Start either end and no problems... After doing the match drilling, there were no other problems found. I broke the drilling down into multiple sections and did the first on this date.