Hello, with my recent purchase GMF-1600 was a FSN OFA Attachment you can see here:
FSN OFA Professional Systemzubehör Oberfräsen | Bosch Professional
This is 70Eur attachment marketed as Professional.
The problem is with very bad tread quality used as "Professional" adjustment for position on a rail.
You can see the photos that show the quality of the thread:
Photo 1
Photo 2
Video see the wobble for yourself:
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