Inner Rotary Hook (Bobbin Thread) Tension - Brother BC800 Service Manual

Adjustment
1. Set a bobbin (wound with Schappe Spun Sewing Thread #60) in the inner rotary hook and thread.
2. Pull the thread with a tension gauge, and adjust the tension adjusting screw so that it is 0.1 - 0.12 N (10 - 12 g).
XA9153001
Schappe Spun Sewing
Thread #60
4 - 14

Inner rotary hook (bobbin thread) tension

0.1-0.12mm
Sprig adjusting screw
Tension gauge 30 (0.3 N)
(10-12g)