Completed step 7 page 21-13 – reamed holes in WD-1210 control column with #12 and ¼ reamers as required to remove powder coat from holes. Trial fit WD-1210 control column to control column mounts per step 1 page 21-14 to determine proper washers prior to installing F-1203A bulkhead assembly. Recorded washers in log book. Completed step 1 page 21-13. Clecoed the F-1203A bulkhead assembly to front flange of seat ribs F-1215-L&R and F-1253-L&R seat floor supports. Completed step 2 – riveted the F-1203A bulkhead assembly to front flanges of the F-1215-L&R seat ribs per Figure 1. Completed step 3 – dimpled the single pair of nutplate attach holes in forward and aft flange and 4 pair of attach holes along inboard edge of F-1226-L&R seat ramp floors. Completed step 4 – dimpled the single #30 hole in the forward flange and 4-#30 holes along the inboard edge of F-1226-L&R seat ramp floors. Completed deburring and primed parts. Completed deburring and priming of F-1212-L&R step ribs.
