Just a thought…. Have you checked the assembly retainer screw that helps secure the turn signal assembly to the steering shaft?. If this comes loose the whole assembly will move when you try to engage the turn signal. This one little screw holds everything tightly in place.
the screw is small, typically only visible when installed on the car from the underside of the turn signal assembly. It does not require much force to have it hold the assembly tightly in place. When loose it will begin to manifest as a little movement on the turn signal assembly when you try to engage it.
the assembly, if memory serves me from the last time I service mine, does not have any bearings, just grease, copper washers & connectors and some plastic bits isolating the connections. Super easy to service if you connections start acting up.
Sample pic below.
hope this helps.