Brother T-8420B Instruction Manual page 26

<For non-foundation specifications>
Do not pass the
thread through.
<For foundation specifications>
Center
Pass the thread
through.
<T-8420B, 8720B> <T-8450B, 8750B>
T-8420B, 8450B, 8720B, 8750B
5. PREPARATION BEFORE SEWING
If the tension discs are opened as
follows, the thread will become easier
to thread.
・ Press the tension release plate (2).
・ Operate the lifting lever or the knee
lifter to raise the presser foot.
The thread can be passed securely in between
the tension discs.
Pass the thread on the inside of the tab (3).
2984M
20