Singer S18 - Seam and Overcasting Stitches

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Setting mark (A)
Cam (B)
Setting mark (C)
Belt wheel (D)
Spring pin (E)
SETTING POSITIONS OF UPPER AND LOWER SHAFTS
When the setting mark (A) on the cam (B) is exactly at the top, the spring pin (E) is vertically straight and
the setting mark (C) on the belt wheel (D) should be in the position as shown.