Duerkopp Adler 739-23 Maintenance Instructions Manual page 20

15
3-20
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Replace throat plate and slightly tighten throat plate screws.
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Adjust the height of the fixed blade.
Allow for a distance of approx. 0.2 mm between the bottom edge of
the blade and the top of the throat plate.
In all three positions shown above, the fixed blade must be in contact
with the throat plate button 15 and rotate smoothly.
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Check the position of the fixed blade in relation to the throat plate.
To adjust its position, press a screwdriver against the fixed blade.
In all of the three positions shown above, it must not recede and
must at all times touch the throat plate button 15.
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Adjust throat plate and tighten throat plate screws.