Problem with hook gib (Gegenspitze) on a rotary hook Dürkopp 291

[Gymnast]

I know the German term, "Gegenspitze" for a point part of the hook, where the upper thread leaves the area, when pulled the last part up by the take-up lever. It is the point you see here:

For some machines like the Singer 211W this "Gegenspitze" is part of the hook gib.

My problem is, that the thread is pulled hard by the take-up lever on this Gegenspitze before the thread finally is pulled off the end of the tip. I have read, that the reason for this tip is to avoid, that the hook may catch or damage the remaining thread when it comes around the second time. I know that only a few rotary hooks got this tip. 

I have of cause checked timing and some other matters in order to fix this problem. One matter was to grind and polish this tip. It do get worse with thicker thread (I have tried Tex 70 and Tex 135 Amann Serafil). I know another user with another Dürkopp 291, that have used the machine without this tip and with no problems. And I have tried the same with some threads and fabrics, and I have not seen problems either. But I also have got some warnings about that from a sewing machine repair professional. I have also been told, that this hook have been made with specific differences, that may relate to subclasses. The original subclass of this machine is E1 and it is one of the early versions of the machine.

I have tried to measure the length of this tip when taken off in order to possibly compare the length with other users:


Do you know about the issue with this "Gegenspitze" and possible ways to fix it?

Edited 1 hour ago by Gymnast