As previously described, pulling STAINLESS rivets on the Port and Starboard canopy sides in tight holes cracked the canopy all along both sides. I modified a 3/32 or so drill bit per Bingelis "The Sportplane Builder" to a needle like point, and flattened the cutting edges so it scraps rather than carves. I drilled MOST of the cracks, just beyond the tip of the visible crack, IF they had run up far enough to be visible above the aluminum trim. Next I'll fill the holes with clear silicone caulk.