Tone arm needed!!

[aledg1982]

Hi all,
I was trying to restore a german gramophone I posted here some months ago, which is a mix of new and second hand parts.
The tone arm was broken, and now I have this bracket but I can not find a tone arm that fits into it.
The strange thing is the screw, I think I need a tone arm with a sort of "ring" that could be inserted into the screw...
Or maybe the screw is not original. The tonearm has to be 4,7 cm tall.
Obviously I don't know the model of the gramophone, the motor has an "S" with vertical line over it as logo.

Thank you in advance,
Ale