Necchi 4757 - need to know which way the needle goes, and is treaded... from to back or left side to right? I recently bought a used one and it had no needle in it. I also need help with proper threading. thanks

It sounds like there may be an issue with the needle clamp on your Necchi NC204D sewing machine. The fact that the needle falls out when you try to tighten it suggests that the clamp may not be holding the needle securely.
Here are a few steps you can try to fix the problem:

1. Check the needle clamp: Make sure that the needle clamp is tightened properly and that the screw is secure. Also, make sure that the needle is inserted all the way into the clamp.
2. Check the needle: Make sure that you are using the correct type and size of needle for your machine. The needles that came with the machine should be the correct size, but it's good to double-check.
3. Check the needle plate: Make sure that the needle plate is clean and free of any debris or burrs that could prevent the needle from seating properly.
4. Check the needle alignment: Make sure that the needle is aligned properly and that the flat side of the needle is facing the back of the machine.
5. If the problem persists, it's best to contact Necchi customer service or a professional sewing machine technician for further assistance.

It's important to note that working with a sewing machine can be dangerous, if you're not comfortable working with it, it's best to get it serviced by a professional.

when you put the bobbin in the carrier make sure you have about 6" of thread out
next adjust the needle thread tension right up

There is a lever for positioning the needle bar. When you move the lever to the left middle or right , the needle bar too should follow the same. Try to do that. If it doesn't follow the lever and stays at one end, that means the machine needs to be oiled. Not like most sewing machines Supernova swings the bottom rod too to left and right when Zig Zag is engaged. I recommend to spray some WD 40 first, to inside of top and bottom side of the machine , and later to apply machine oil to every moving joints.

you said you took out the needle, when you put the needle back in
did you turn the needle the right way as you were inserting it into the
needle holder

as for a manual try these sites
sewingpartsonline.com
sew4less.com
sewusa.com
ebay
is the needle the correct one for the fabric, if your overalls are denim
the you need to use a denim needle, flat side goes to the back of the
machine.
as for a sewing machine shop, in your browser type in sewing machine
shop in NZ & see what comes up.

make sure the sewing machine is turned off first
the flat side of the shaft of the needle goes toward the back of the machine
insert the needle as far up as it will go

From the reel pin take the thread to the left and over the top thread guide above the takeup lever, make sure the takeup lever is up and and make sure the presser foot is up, take the thread straight down and round the right hand side of the tension unit and back up the left hand side to the takeup lever, thread the takeup lever right to left and take the thread down any guides to the needle, if the bobbin case goes in the front thread the needle front to back, if the bobbin case goes in the side thread the needle left to right.

Try ebay for a parted out machine.

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Beginning with the spool, guide the thread through the thread guides to the tension assembly. Pull the thread through the tension assembly and test it to make sure the tension is working correctly.
(To do this test, adjust your tension setting to normal or medium or 5 or something in the middle. Raise the presser foot and pull the thread through the tension. It should pull easily!! Lower the presser foot and pull the thread. It should pull noticeably harder.) If it passes this test, continue up through the take up lever,then down through the thread guides to the needle. Make sure your needle is fully inserted and turned the correct way.( If you load your bobbin case from the left side,the needle rule is normally FLAT to the RIGHT is RIGHT. There are some exceptions. If you have a newer style drop in bobbin or your bobbin case loads in the front then the rule is FLAT to the BACK.
sewman7

This site (www.sewusa.com) sells manuals for many types of sewing machines. It also has a section (on left side of home page) that provides basic information about treading (bobbins too) and repair.

I also own a 525 FA and just read that someone considers it is a piece of junk. I'm having problems with the tread breaking constantly (with many hours spent on this problem) and I even have a manual! Perhaps it is a piece of junk?

Good luck!

Marla