Completed Step 3: Final Drill (ream) #40 holes in Trim Tab Skins, then disassemble. Trimmed ends of TE to proper length. Step 4: "Break" TE skins - to minimize "curl up" when riveted. Used Cleaveland Edge Forming tool .
Step 5: Countersunk both sides of TE for Trim Tab...same as done previously for remainder of Elevator TE.