Threading the needle on your Brother LS 2125
To thread your Brother LS 2125, raise the presser foot lever all the way up, then follow the machine's built-in thread guides from the spool down to the needle. The presser foot must be raised because this opens the tension discs — if the foot is down, the discs clamp shut and the thread cannot pass through. Start at the spool pin on top of the machine, guide the thread down through the first guide (a small hook on the machine's face), then through the tension dial, then through the second guide just above the needle, and finally through the needle's eye from front to back.
The entire path is marked on the machine with small numbers and arrows. Follow them in order. Most threading mistakes happen because the presser foot was left down or the thread skipped one of the guides. If your thread keeps breaking or stitches look loose and loopy, the thread probably did not seat properly in the tension dial — unthread completely and start again with the presser foot raised.
Key Takeaways
- Always raise the presser foot lever before threading, because the foot controls whether the tension discs are open or closed.
- Follow the numbered guides on the machine's face in order: spool pin, first guide hook, tension dial, second guide, then needle.
- Thread the needle from front to back, and make sure the thread sits all the way down in the tension dial or stitches will be uneven.
- If stitches look loose or thread keeps breaking, unthread completely and try again rather than adjusting tension first.
Step-by-step threading with the presser foot
Start by raising the presser foot lever, which is the small lever on the back right of the machine. Lift it all the way up until it stops. You will hear or feel a slight click. This action opens the tension discs inside the machine so thread can pass through them.
Place a spool of thread on the spool pin at the top of the machine. The spool pin is the metal rod that sticks up from the top. If you are using a small spool, use the small spool cap that came with the machine to keep it from sliding off. Wind the thread around the spool pin once if you are using a large spool, or skip this step for small spools.
Now guide the thread down from the spool. The first stop is the thread guide hook — a small metal hook on the upper left face of the machine. Pull the thread through this hook. You will see it marked with a small number or arrow on the machine itself.
Routing thread through the tension dial
From the first guide hook, bring the thread down and to the right toward the tension dial. The tension dial is the large round dial with numbers on it (usually 0 to 9). You will see a small slot or opening in the dial. Insert the thread into this slot so it sits between the two metal discs inside. The thread should go in from the top and sit snugly in the middle of the dial.
This is the most important step. If the thread does not seat properly in the tension dial, your stitches will be loose and uneven. You should feel slight resistance when you pull the thread — that resistance is the tension discs gripping the thread. If you feel no resistance, the thread probably missed the slot and is sitting on top of the dial instead of between the discs.
After the tension dial, guide the thread up and to the right toward the second guide, which is a small hook or loop just above the needle. Thread it through this guide as well.
Threading the needle and checking your work
The final step is threading the needle itself. The needle is the small metal piece at the bottom front of the machine. The needle has a small eye (hole) in it. Hold the thread and insert it through the eye from front to back — meaning the thread comes toward you, goes through the eye, and exits away from you. Do not thread it backward, or the needle will not catch the bobbin thread correctly.
Once the thread is through the needle, pull a few inches of slack thread down and to the left, away from the needle. This slack gives the thread room to move when you start sewing. You are now ready to wind a bobbin and begin sewing.
To check that you threaded correctly, hold the thread above the needle and gently pull down. The thread should move smoothly without catching. If it catches or feels stuck, the thread probably missed the tension dial. Raise the presser foot again and rethread from the tension dial onward.
Common threading mistakes and how to fix them
The most common mistake is leaving the presser foot down while threading. When the foot is down, the tension discs clamp together and block the thread. Always raise the presser foot first. If you forget and the thread will not move through the tension dial, straightforward raise the foot and the thread will slide through.
Another frequent error is threading the needle backward (from back to front instead of front to back). This causes the needle to miss the bobbin thread, resulting in loose stitches on the bottom of your fabric. Check the needle direction: the thread should enter the eye from the front of the machine and exit toward the back.
If your stitches look loopy or loose after threading, do not adjust the tension dial yet. Instead, unthread the entire machine and rethread, making sure the thread seats fully in the tension dial. Loose stitches are usually a threading problem, not a tension problem. Only adjust the tension dial if stitches remain loose after rethreading correctly.
Threading with different thread types
Standard polyester or cotton thread works with the standard threading path described above. However, thick or specialty threads may need the spool positioned differently. If you are using very thick thread, try placing the spool horizontally on the spool pin instead of vertically, or use the auxiliary spool pin on the side of the machine if your model has one.
Metallic or delicate threads can shred if pulled too tightly through the tension dial. If you notice thread fraying or breaking, lower the tension setting (turn the dial toward lower numbers) and rethread. You can also try threading through the guides but skipping the tension dial entirely — some machines allow this for delicate threads, though you will need to adjust tension more carefully.
For most everyday sewing, the standard threading path works fine. Specialty threads are less common for beginners, so focus on mastering the basic method first.
Frequently Asked Questions
What happens if I sew without raising the presser foot?
The thread will not pass through the tension discs, so the machine will either not sew at all or produce very loose, uneven stitches. Always raise the presser foot before threading and before sewing. The foot controls the tension system.
Can I thread the needle while the presser foot is down?
You can insert thread through the needle with the foot down, but the thread will not be under proper tension. Always raise the foot before threading the entire machine so the tension discs open and the thread seats correctly.
Why does my thread keep breaking?
Thread usually breaks because it did not seat in the tension dial, the needle is bent or inserted backward, or the thread is old and brittle. Rethread completely with the presser foot raised, check that the needle is straight and facing the correct direction, and try a fresh spool of thread.
What if thread is stuck in the tension dial?
Raise the presser foot all the way up. This opens the tension discs and releases the thread. You can then gently pull the thread out. If it still feels stuck, do not force it — raise the foot higher or check that the foot lever is fully up.
Do I need to rethread every time I change thread color?
Yes, you should unthread the entire machine and rethread with the new color. This prevents old thread from mixing with new thread and causing color inconsistencies or tension problems. It takes only a minute and ensures clean stitches.