2) Adjustment value ................................................................................................................................38
(1) Thread tension ............................................................................................................ 40
1) Strength of tension spring ..................................................................................................................40
(2) Upper looper ............................................................................................................. 40
(4) Caution in assembly ................................................................................................. 41
1) Application of sealant .........................................................................................................................41
1) Motor pulleys and belts ......................................................................................................................46
AND LOOPER TIMING ................................................................................ 47
(1) MO-6700D SERIES .................................................................................................... 47
(1) Semi-sunken type ..................................................................................................... 60
(3) Fully-sunken type ..................................................................................................... 62