I have been chaging my serger to overlock for the purpose ofdoing rolled overedge. Rethreaded numerous times, have read the instructions many, many times, setting tensions, etc. I cannot get it to even make a chain, It will only make needle holes. I have used this feature in the past, but cannot find the reasons I canot make it work this time. I am a little suspicious of the needle. Don't know if I have it clamped far enough, but it seems to be okay. I have a Simplicity Serge Pro Sw 432.

How frustrating, I've tried to find a manual on this model so I can see how you make the change to the thread finger on the throad but couldn't see one. So, I'll go through the set up for 3 thread rolled hem on mine, it probably won't be identical but it might help.

First, remove thread from left needle and remove the left needle from the holder leaving just the right hand needle in place. Most sergers have two seperate needle screws so this can be done but as you mentioned, recheck again that the right needle is right up into the housing as high as it will go. I presume you are using a fresh smaller size needle, especially if this is on a fine or lightweight woven like organza, I'd put in a size 70. If a mid weight then size 80.

Now there should be a thread finger on the foot you change with your screwdriver. Or a little switch you flick so that the throat plate is a different shape to form the narrow seam. Your manual should have this step.

Now if you have some, put wooly overlock thread into your top looper, I cut the thread about 10 inches above the tension dial, put the new spool on, knot it to the existing thread tail, turn tension to zero and pull it through and through the looper eye.

At this point, you should have the two looper threads loose, lift the pressure foot and pull these two threads under the foot and out the back. Turn tension back to about 3 on top looper and tighten up lower looper to 5 or 6 and leave needle at 5.

Adjust blade to cut quite wide, ie wind it to the right side. Now thread the right needle and pull this thread out the back too. Lower the pressure foot, introduce a piece of fabric in under the foot, press the pedal and start trimming and chaining off.

You should have a chain stitch happening now - if not, recheck your threading, particularly the needle, sometimes the thread looks like its in the needle eye but is hooking around the looper. If you still can't get any joy, then it is possible that the timing is just slightly out and this is affecting this stitch. You could try setting up for a normal three thread seam and see if this chains okay.

If you are getting a chain happening now, then adjust down the stitch length to make it denser so it is covering the fabric and check the underside, adjusting top and bottom looper tensions so the thread is enclosing the fabric end rolling to the underside and covering any little fibres.

I hope this is of some help - however, if it still isn't giving you a chain, it could be the timing is out in which case, unfortunately service time.