Positioned and drilled as per instructions. I did NOT widen aileron pushrod slot as it was to the dimensions as noted on Figure 57. I'm assuming since my spars are new then this modification is not needed. I'm always cautious when drilling the spar so I took my time orientating myself to where I was and where I am going. I will countersink holes for AC3 so they do not interfere with brackets. Got to use my right angle drill attachment and it worked well.