SINGER SEQS-6000 FUTURA QUARTET Instruction Manual - Manual (Page 11)

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 If the threading hook is deviated from needle hole,
adjust the position of the hook using a small screw
driver.
 If the threading hook cannot catch thread, adjust
the vertical position by bending the twin thread
guide.
HELPFUL SUGGESTIONS:

Put a drop of sewing machine oil onto the felt disc,
if the machine is used after a long interval.
Felt disc