[Widows Son]

I just replaced the turn signal assembly last week on my BDR. In fact, I took advantage of that by rotating 180deg so it was in the left of the steering column.

The column and arm assembly are keyed. The set screw is not to prevent rotation but rather removal of the assembly off the column. The column has at 1 o'clock a welded key. The assembly/arm slide onto that key to prevent rotation. The set screw tighetns the assembly onto that key. At least this is how it is in my BDR and the new arm assembly I bought of Backdraft's parts website. If your arm is rotating I would wonder if the arm assembly has moved up the column (I.e. towards your chest) where it is no longer "keyed" to the column. Hard for me to believe that though. Is the assembly seated as close to the dash as possible? Has the column possibly slipped down? Check the latter by looking in the engine bay and ensuring the chrome column has not slid down since its held in place by a bracket by the brake reservoir and by a collar on the steering shaft (which is inside the chrome column).