Bobbin case on my 524fb necchi has come apart

They will only go in one way, they have to be correctly orientated.

https://www.google.com/search?q=Necchi+model+3355+replace+bobbin+case

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Hi Travis.
try this link out.
https://ifixmachines.com/index.php/product/1593-necchi-sewing-machine-524-fb-manual?graphicMode=default
or this one.
https://www.google.com/search?q=free+owners+manual+for+a+necchi+sewing+machine+model+524Fb&rlz=1C1AVFC_enGB797GB798&oq=free+owners+manual+for+a+necchi+sewing+machine+model+524Fb&aqs=chrome..69i57.9236j0j9&sourceid=chrome&ie=UTF-8

NO. IF IT IS TOO TALL IT WILL CAUSE A PROBLEM. GO TO THE LOCAL SEWING MACHINE SALES AND ASK IF THEY HAVE THE RIGHT ONE. ALSO, YOU CAN TAKE OUT THE BOBBIN CASE (HOLDS THE BOBBIN) AND TAKE IT WITH YOU. MAKE SURE IT DOESN'T EXCEED THE HEIGHT OF THE CASE AND IT SHOULD SPIN FREELY.

HINT: before you install the shuttle, make sure to place a drop of sewing machine oil around the outer edge of the shuttle and lightly spread it around the outer edge (you should do this about every time you change a bobbin). Sorry, you'll probably need to be familiar with removing and installing the shuttle. Have patience! Once you've done it a couple of times, you'll wonder why it was so difficult.

It usually helps if you can tilt the machine back about 45 degrees so it is supported by something (pillow, cushion) so you can get good visibility into the bobbin area.

Raise the needle so that the take-up bar is at its highest point.

Make sure the outer hinged door on the shuttle area is open. Inside that open door is a metal unit that is shaped like a "C". The shuttle makes up the other part of the "C". The two C's face each other and complete the circle. Grasp the shuttle by the projecting bobbin pin. (Perhaps the photo & videos will help you in placing the shuttle (you'll probably need to wiggle it around a little until it pops into place.) Once the shuttle has snapped into place and you've closed and latched the outer cover, you can install the bobbin case.






Necchi Zig Zag Shuttle movement

Necchi Oscillating Shuttle

here is 2 links for a manual,, you can choose which one you want
http://www.sewingpartsonline.com/instruction-manual-necchi-522-and-524fb.aspx

http://sewusa.com/Sewing_Machine_Manuals/Necchi_Manuals/524FB_Instruction_Manual.htm

try changing the needle to see if that helps
if it doesn't,, then I suggest that the sewing machine be checked
at a repair shop to see if the bobbin case needs to be replaced and
to see if the hook and the hook race need to be replaced

here's a link for a manual for the machine

http://www.sewingpartsonline.com/instruction-manual-necchi-522-and-524fb.aspx

Hi,
Check out www.sewingstyle.com. I saw a foot control for a Necchi 524 there for around $25. I hope it was you are looking for. Good luck

Inserting bobbin into the bobbin case or problem inserting bobbin case into the shuttle?

Make sure the thread will feed from the bobbin clockwise and through the guide on the bobbin case.

Lift the lever on the bobbin case to hold the bobbin in place as you inset the bobbin case into the shuttle.

If the bobbin case for this machine as a "finger", this has to align with the opening in the shuttle.

If you cannot readily see this - move the bobbin case a bit to the left and right until it clicks into place.

Look in the bobbin area to see where the screw fell out. Check your manual. Sometimes they have a good picture of the bobbin area.