Hi, I have a used singer 491D300AA and I have the following problem: as I sew the thread twists and is eventually cut after it has reached the needle. Do you have any idea why this is happening? thanks in advance, Julia

try this link out.
Stitching Odyssey How to use your twin needle
or this one.
https://www.google.co.uk/webhp?sourceid=chrome-instant&rlz=1C1CHBD_en-GBGB719GB719&ion=1&espv=2&ie=UTF-8#q=How+do+I+use+a+twin+needle+on+a+Singer+4411.+I+would+like+to+know+how+to+thread+a+twin+needle+on+the+Singer+4411.

In most machines you do as follows.
Insert the second spool pin and place a spool of thread on each. Thread in usual sequence but make sure to pass one thread to the left and one to the right of the tension disc and do not allow the threads to twist together then thread needles manually.

The tension is too tight, adjust the tension dial down to around 4ish and see if that helps.

There is a product on-line called the "Wonder Thread Guide" (made in USA). ** F&E Company, Montrose, CO 81403**

I used it to replace a broken thread spindle, it works by sliding a spindle over the stub of the broken one, so thread stand upright instead horizontally. It is MARKETED to eliminate tangling, twisting, breakage, etc. Functions on all sewing/embroidery / quilting machines.
Sandy34287

When you begin the stitching, hold on to the thread tails and lower the needle into the fabric. Hand walk a couple of stitches and then use the power pedal.

Some use a "leader". This is just a small scrap of folded fabric that they begin the stitching with; stitch off and then start sewing their project. The leader thread is cut and used over and over until it resembles another term for this method - a "spider".

"Birdnesting" occurs when there is no tension on the needle thread to pull the bobbin thread. This is easily corrected by rethreading the machine, following the threading path carefully and making sure the thread is fully engaged in the tension mechanism.

The tension of the upper therad is too tight. loosen it by following the instr in the manual
or the upper thread is notspinning off the feel freely while sewing. Make sure the upper thread is not getting cought while sewing,
Ot the upper thread is incorrectly threaded, remove the thread and rethread the machine.
Good Luck.

my wife's hd110 singer machine is not keeping tension. what can I do/ look at to try and help this

sometimes the thread on mine will get twisted and creates too high a tension. try re-threading . Mine did this , I have no idea how it got twisted behind there, but it did. I have to re-thread from the spool down.I am used to industrial machines and tend to have a heavy foot on my poor little Singer. That is about all I can think of that may have caused it.

hi my names angela ive been a seamstess all my life. and it seems there could be a number of soulutions to your problem.first check your needle is in the correct way with the long ridge of the needle facing inwards.
second check you have the thread threaded correctly and it isnt twisted around twice anywere. and check that it pulls quite freely with ur foot lifted.
third. it could be flaw with ur spool case check it isnt damaged by running your finger along the edges if its catching u can file it down a little with a nail file.
fourth it could be your spool is not high enough in the case. so place ur case on a peice of paper and cut around a circle cut a smaller circle inside and insert it into ur spoolcase if your thtead is pulling to tight then you dont need that solution.
well i hope i was useful to you angela,,