Necchi NC-204D Instruction Manual page 61

The red mark is the standard setting for
regular button, adjust the pointer align with
the red mark.
The buttonhole adjustment button provides a
further range of buttonhole size adjustment.
(Page 26)
①
Regular button
The buttonhole length may need to be
increased for thick button, adjust the pointer
toward to "+" for fine tuning.
①
Thick button
The buttonhole length may need to be
decreased for thin button, adjust the pointer
toward to "-" for fine tuning.
①
Thin button
Attach the electronic buttonhole foot and plug
the cord into the socket above the presser
foot bar.
The upper thread should be passed through
the hole of electronic buttonhole foot
and bring the upper thread to the front of
electronic buttonhole foot.
①
Cord
②
Socket
53