Bobbin housing fell out - Singer 1725

That sounds like the Bobbin Hook, the part that picks up and loops the thread.

https://www.google.com/search?q=sewing+machine+bobbin+hook

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It will probably be better to just purchase a new replacement bobbin case. Bobbin cases do wear out and since yours fell apart, it may be suffering from use and age. There is also the hassle of trying to get the bobbin tension correct. New bobbin cases generally do not cost that much and you will know that it is factory set and ready to go in your machine.

Without knowing the make & model machine, we are basically unable to assist. Probably, the best thing you can do is download a copy of the user instructions:

Make Model manual

There should be an access cover to the bobbin area. Most likely, the needle is either stuck inside the bobbin area or has dropped through to the bottom of the machine. As for installing the bobbin & bobbin case, the manual should have instructions for your to follow.

The part fell from the bobbin case, it would probably be better to just purchase a replacement bobbin case.

Can you take a pic. And send it?

You can see a the directions on www.ehow.com, they have nice large diagrams. About holding the bobbin case and the tab being used to insert it in the shuttle case. Your manual does a decent job too, with diagrams that you can enlarge. If, you can't find your manual go to www.brother-usa.com and under support you can get a copy to download for free. Save it to your computer.

Try replacing the needle. sometimes a bent needle causes this.

It sounds like your timing may have been altered when your bobbin housing fell apart. This is difficult to repair without specialized tools and knowledge, so best get it to a repair shop.

If the machine is a common brand like Singer or Kenmore, go online and search for a manual. Many are available for under $10 or are free to download.

Make sure the needle is in the highest position before you try putting the bobbin holder in. The bobbin holder has a metal 'finger' which fits into a 'slot' in the housing and it only goes in if you have the needle up.

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.