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The manual should have instructions. Most overlocker needles have a screw that holds each needle in place. Just loosen the screw with the screwdriver that came with your machine, slide the old needle out (note which direction the flat side of the needle is facing), insert the new needle as far up as it will go, and tighten the screw. Don't lose those screws or drop them inside the machine. If you remove a needle so you can serge without it, be sure to tighten that screw so it doesn't fall out.
That is not a twin needle. It is actually two individual needles that are separate. (There are actually some stitches that you would use only one needle, ie hem.)
The manual will have instructions on how to replace the needles. There appears to a hex screw immediately above the needles that is used to remove or secure the needles. With the hex tool included with your machine, loosen that set screw (be careful because both needles will become loose and can drop down into the machine). Hold the needle(s) with the flat side facing the back of the machine, slip them all the way up in the needle holes, hold them in place while tightening the hex screw. Be Careful to not lose the hex screw that hold the needle or drop the screw or needle down into the machine.
Check around the bottom inside the machine. If it is not sticking in the needle plate or stuck in the bobbin area, then it has dropped all the way through. Be sure to remove not only the bobbin, bobbin case, but also the hook if possible. You may be able to tilt your machine or gently shake it and the needle will appear.
Plate on bottom:
Remove screws. Keep screws in safe place and oil moving parts with good quality sewing machine oil. Zoom with spout for sewing machines & servers is what I use purchased online...lubricate gears with Singer lubricant (in tube). Tip machine back onto a towel to remove screws. Just one drop oil on moving parts & dot of lube gear only if not showing signs of grease already. Please remove bobbin and presser foot before cleaning/oiling. One drop oil then generously SMEAR oil on oscillating hook,
open right front door & one drop top of needle bar.
Clean out race shuttle for lint, fuzz balls, broken threads with soft sewing machine brush & clean your feed dogs gently with bristles too.
Hope this helps. Do not clean machine near children or curious pets! I run my machine with pedal on table top so I don't accidentally step on it. Control with right hand to see moving parts. At your own risk, of course. Safe and effective but only if you are extremely careful. Replace all screws securely. Put in new needle all the way UP into needle bar groove, presser foot UP turning handwheel towards you, flat end of needle to back,
Thread Front to Back of needle.. Keeping presser foot raised @ highest position ensures thread locates the tension slots properly.
Remove bobbin and presser foot, and tip machine on its side onto a towel.
Remove bottom plate w/ screw driver.
Oil moving parts with Zoom Sewing Machine oil, one drop, and lube up gears that show dryness with Singer lubricant in tube. One drop oil top of needle bar, one drop on oscillating hook in race shuttle.
Remove bobbin, presser foot, needle.
Tip machine back on towel gently. Unscrew plate--don't lose screws!
Do not service in presence of children and curious pets. Put foot pedal next to you on tabletop.
Use Zoom Sewing Machine oil. Any part MOVING that are NOT gears get one drop oil. Any DRY
ONLY gears get dab of Singer sewing machine
Replace screws. Secure screws.
Open left front compartment & one drop oil @ top of needle bar.
Open race shuttle (where bobbin case fits in).
One-half drop oil of on oscillating hook (bottom left - hand corner...smear that oil around!
Insert NEW needle all way UP in needle bar groove, flat needle shank toward back.
Turn handwheel towards you and raise. Raise presser foot so that threading locates all tension slots a's you pull thread TAUT from spool to each tension slot and left to right through silver, metal take-up lever, and down to tension bracket, pass needle, then pull 6" thread towards you and thread from FRONT to BACK of needle.
Place bobbin into case and "thread" it. Set presser foot on DOWN position. Turn handwh towards you, dipping needle into needle plate. Make loop with bobbin thread, pull towards you. Place a good 7" underneath presser foot (both threads).
Let machine RUN on 24" scrap to distrubute oil/lube.
You can send out to repair to have it lubricated & oiled, or you can do this yourself. Not recommended though if you have pets or kids where you are working on machine.
Remove needle, thread, bobbin.
There are screws underneath.
Don't lose them!
One drop good quality oil on moving parts so lay machine back on a towel, remove screws, keep foot pedal up on table so you don't accidentally hot it with your foot. All gears that are not greasy get a very small dollop of lubricant (Singer makes a good
one comes in red &white tube). All parts moving get
the oe drop oil. Put plate back on, firmly tighten screws. Never lube or oil plastic parts!
A drop of oil any metal screw located on top of machine. Lift machine up and if tip can be removed, you can check moving parts needing oil there and replace lid.
If front section opens--left of needle bar--open it up and oil moving parts..I usually just apply one drop oil to TOP of needle bar Close lid.
Put one drop oil on shuttle hook bottom left.
Never oil tension discs.
Run machine with scrap of fabric to get her nice and smooth sailing.
If motor sounds like it's running heavy after that, take in for service, but unless motor needs replacement, you should see noticeable improvement immediately.
Good luck and hope this helps!
Remove screws on top
Remove screw at the bottom of the needle bar while holding needle carefully so it doesn't drop down into your sewing machine. Push new needle all the way up until it won't go any farther and make sure the flat side is in back, the rounded side should be facing you. Tighten screw securely.That's all there is to it! Hope this helps. Jimmy
Put just one drop of good quality sewing machine oil on moving parts. You can set machine back gently on towel. Remove bottom plate by removing each screw. Set each screw in a bowl so they don't roll anywhere. I have 30 years experience, so I personally run my machines when oiling so I can observe the parts that move. I d on't recommend this if you have pets & children, and leave that up to you!
You should probably unplug machine and just look for anything that is NOT a gear, and just put one drop oil on those parts. Singer lubricant should go on actual gears, but ONLY if not already "greasy". Reassemble bottom plate. If your machine left front section opens up, one drop on those moving parts, and smear one drop of oil on hook. One drop top of needle bar. Do NOT oil or lube plastic parts. Never use cooking oil or bath oil; it will coagulate & damage machine. Always run machine with a scrap of fabric for a bit to distribute oil and to make sure excess does not get on your good fabric. Then rethread machine and replace bobbin and put fresh needle in. Yes, removed thread, bobbin, and needle BEFORE you lube & oil.
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Best of days and nights sewing,