I am practicing with my new Avery Tools awaiting arrival of the 10 empennage kit. Three questions; 1) I have practiced with the Hand Rivet Squeezer on universal rivets. Much harder than with the rivet gun. Is the Hand Rivet Squeezer used to set AN 426 rivets or is this done with the rivet gun? 2) The Avery Tool Kit came with three different sized cupped rivet sets. The have coordinating flat portions. The largest cupped set is the smaller piece. In addition one of the coordinating flat portions is as tiny. Why the three smaller coordinating flat pieces? 3) How do you get the cutting head out of the microstop countersink cutter set? After I countersink some holes, it is difficult to remove the cutter head.