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There was a discussion about 9 months ago here : https://dreiradler.org/viewtopic.php?f= ... 8&p=248877
It's in German, so you might need Google translate or similar. Here are 3 of the offerings:
"About 50 years ago I removed a torsion bar to transfer it.
On the outside, 2 shells are vulcanized onto/into a rubber element (spring).
Offset by 180°, 2 longitudinal grooves are free.
There are 2 rectangular strips in the frame tube
into which the suspension is inserted."
"The front bearing should consist of two half shells rotating in a bearing cup. After opening the clamp on the frame, the story should loosen up. The torsion spring lock can also be located behind the front bearing. In that case, the rear bearing could also be welded in, but that would mean that the torsion bar would actually be broken"
"The torsion bar should rest in two bearings, the rear of which is secured in the frame with pin or grub screws. This must be pulled out during disassembly. The axial securing of the torsion bar is in front of and behind."
Hope there's some sense in there,