Duerkopp Adler 506 Service Instructions Manual page 31

Setting switch b10
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Loosen screws 1 slightly.
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Slide switch b10 upward so that cam 2 reaches the switch sooner.
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Tighten screws 1.
The outgoing flank of the 1st position may not lie together with the
incoming flank of switch b10.
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Set switch b10 to cam 2 as described above.
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Check position 1 (thread lever low position) of the synchronizer
(see Chapter 10.5).
–
If necessary re-adjust switch b10.
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