Section 26 Completed deburring and priming (4) F-1237C-L&R Seatback Angles. Pg. 26-02 Step 1: Trimmed the bottom corners of the F-1237C-L&R Seatback Angles to the reference notch. Step 2: Separated the F-1237B Upper Seatback Angle from the F-1237D Lower Seatback Angle. Deburred and primed the angles. Step 3: Separated the F-1237G Seatback Braces, deburred and primed.