Duerkopp Adler 669 Premium Operating Instruction page 29

Operation
Operating Instructions 669 PREMIUM - 00.0 - 11/2016
Fig. 8: Thread clamp (optional)
17. Insert the thread into the thread clamp from the left so that
the thread is held in place inside the hook of the clamp.
The thread is supposed to run through the clamp almost without
touching it and in such a way that it only makes contact with the
guides above and below the thread clamp.
18. Feed the thread through the thread guide (14) on the needle
bar.
19. Insert the thread through the needle eye in such a way that
the loose thread end faces the hook.
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