Perpetuum Ebner Rex turntable

I recently acquired one of these bad boys and noticed a spring-like wire (almost like the hook you use to hang up Christmas ornaments) towards the back, underside, of the tone arm, just sticking out. Should this be connected to anything? Or is that how its suppose to be?

Thanks
Dewey

Is this the Rex, Rex A, Rex AA, Rex S, or Rex Deluxe?

How can you tell? I've looked under the platter and motorboard both and found nothing. If it helps, this model uses the tapping tone arm and the stabilizer disc.

The original Rex has a balancing disc on the changer spindle, a size control on the baseplate, mono wiring and 3 speeds.

The Rex A has the balancing disc, automatic record-size scanning, mono wiring, and 3 speeds.

The Rex AA has the balancing disc, automatic record-size scanning, mono wiring, and 4 speeds.

The Rex S has the balancing disc, automatic record-size scanning, stereo wiring and 4 speeds.

The Rex Deluxe has an umbrella spindle, automatic record-size scanning, stereo wiring and 4 speeds.

The PE 66 has an overarm, automatic record-size scanning, stereo wiring and 4 speeds.