With everything on the left Aileron completely drilled and cleaned up(deburring holes and edges) I needed to counter-sink the Aileron spar. Now I've read that the depth of these can NOT be too much as the #40 clecos holding that leading edge cuff on will not adequately keep it in place. So I tested and tested on a scrap piece before I committed to the spar. I will leave the countersink cage set and do the right one as well.