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You may be able to obtain a manual for your Reliable MSK 8410B-UT machine by contacting the manufacturer or checking their website. You can also try searching online for a digital version of the manual or contacting a local dealer or repair shop that services Reliable machines.
Be sure that you are threading each thread in the correct order. The manual should have those instructions.
ALWAYS RAISE the presser foot when threading the machine!!!! For most machines, the upper looper is threaded first, the lower looper second (the lower looper thread finishes by draping OVER the top of the upper looper and then pulled toward the back of the machine), then thread the needles. Give each thread an extra little tug when threading the tension disk to make sure it is seated completely.
Even if you are unable to locate a tutorial for your particular machine, most models from the same era will thread the same.
Don't be surprised if it doesn't work the first, second, or even the third try. It took me most of a day to get mine threaded correctly the first time!!! Patience!
Are you looking for a replacement looper? Typically, this is a "take it to the shop" repair because there's some finicky adjustments needed when replacing a looper, but if you have a spare looper and a lot of patience, some people can do it. Because breaking a looper can do a lot of damage, I tend to be of the "take it to the shop" persuasion, but try entering a search for the machine make and model plus the phrase "lower looper" in something like the google shopping search. E.g.: here's the lower looper for a machine I own: http://www.sewingpartsonline.com/juki-mo655de-serger-machine-parts.aspx
Has it ever chained off since you bought it? If you purchased it second hand it is possible that the timing of the loopers is out and this will prevent a chain from forming.
However, I'll go through general overlocker/serger troubleshooting for threading up. The critical things are to thread it exactly as the diagram shows, some sergers have a diagram inside the front looper cover so its easy to refer to when you are working on the machine. Or use the manual diagram. There is a sequence you need to follow in threading up, usually upper looper, lower looper, then the needles. This is important. Then you pull all four threads under the raised pressure foot, lower the pressure foot, and start to stitch and hopefully a chain forms. If you need to change a thread you can knot on a new colour, turn the tension to zero, then pull through the new thread. Pull the knot right through the looper eyes but you will need to cut the knot out and thread the needles with the new colour once you get there. Then turn tension back to the normal setting (5 usually) and again pull all threads under the foot.
The timing of the two loopers to the needles is critical to a stitch forming though so if you have tried everything and aren't getting a result; then perhaps its time to take it to a service centre, get it checked out and if it works fine for them, ask for a quick demo of threading up, then do it yourself with the demonstrator watching.
Overlockers are very different to sewing machines and there is a learning curve but once mastered, they are so quick and give a great finish.
From what I have read this manual is less than desirable. Neither is the one for the brand that I have.
You may have better guidance if you purchase and use Nancy Zieman's "Serge with Confidence". I have found it very helpful.
For the two thread rolled hem, the looper cover is used to "trick" the looper into "thinking" it is threaded.
On my serger (not a Bernina), this is referred to as a "subsidiary looper". It is a spring type mechanism that fits in a small hole at the top of the upper looper.
You use a rolled edge presser foot; right or left needle; stitch length @ normal or wider; stitch length @ 1mm for the left needle/0.5 for the right needle; differential feed @ normal; needle tension - tighten; lower looper tension - normal or looser; two thread looper cover - engaged.
Test and adjust the tension as needed before making the rolled hem on your garment.
The order of threading is most important. If you letter the tension knobs from left to right A,B,C,and D. The order for threading it is C,D, B, A. There are two arms under the needle that cross each other called loopers. The order is upper looper, lower looper, right needle, left needle .I'm sure there is a diagram under the cover when you open it. Most do. It would be very helpfull to use a long threading tweezers to guide the thread through the holes. The lower looper has a hole in the back to put the thread through then through the front hole ( though some newer sergers have a lever that you put the thread on and it does it for you and over the thread of the upper looper and out the back.
It would help alot more if I knew the brand and model of your serger so these are basic instructions. Hope I helped.
Rick
You can get sewing machine manuals online at sewingmanuals.com. I didn't see the superlock 2500 but there were other superlocks. They may thread the same way.
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