First attempt at c'sinking went relatively well after practicing and adjusting depth on a scrap piece. At first I was getting chatter marks but after thinking about it I fixed it by starting the air drill first before starting to c'sink.
Spent more time measuring and re-measuring the location of holes of HS405 to 702 front spar. I wasn't too sure how I should drill these holes because of the tight space. I pilot drilled the first top hole of left HS405 using my dremel tool by putting side pressure on the flexible drill extension but all this did is enlarge the hole slightly. After drilling to final size,and checking closely, the mistake was not as bad and I decided to keep it and not replace the part. In fact only the hole in the HS 405 was enlarged. The spar web was not affected. I attached HS 601PP skin and final drilled all holes to #30. Will think of another method to drill right side rib.
HS 405 marked for drilling. Dashed line is where HS404 will line up
Once pilot holes were drilled, I final drilled from forward side
Lines in top and bottom angles are limit lines. Holes came out just were they should be
