Drilling the holes for CS4 rivets - 4 hours

In all my wisdom, I hadn't opened up the #40 holes in the bottom of the aileron for the CS4 rivets yet, so I spent a bunch of time re-celcoing all the ailerons together and then drilling out the bottom holes that will require the CS4 rivets. All of the holes where dimpled for #40 which is just fine....but drilling the larger hole in the dimple results in a very sharp edge of the protruding dimple. So again I needed to pull out my dremmel and buff each hole with 3M to smooth the sharp edges on the dimple holes. Extremely effective, but time consuming.

Mental note....Drill these holes #30 from the begining (Be sure to drill ONLY the correct holes) and dimple with the CS4 die. It saves time in the end.