I HAVE Kenmore 385 165 24 bobbin case is loose and I can not get even one stich. Do I miss a srew to hold it in a place? Thanks for help.

raise the needle thread tension as it is the controlling tension when sewing
the tread tension is the screw which holds te spring plate in position under which you pull the thread after installing the bobbin into the holder

its the tensioner knob turn it a little bit till the stitch is back to the way its suppose\ed to be, don't turn the knob a lot ust a hair a little AT a time try the stitch each time you turn it to see if the stich is tight again. The knob has numbers on it you have to d this in straight stich setting

make sure the bobbin thread is in correctly and that the tension is correct on the bobbin case personally I would change the bobbin case t0o see if that would fix the issue it usually does.

Suspect the lower drive mechanism is out of time with the upper drive. See your local service agency for repair.

You can purchase that slide plate here:
Singer 758 Sewing Machine Slide Plate

Your needle thread tension is too tight or the bobbin tension is too loose. If it is the latter try turning the bobbin case tension adjusting screw clockwise abot a full revolution.
If that does not work there is more than likely a bit of lint behind the tension spring, so carefully remove it and clean it out.

Sorry to say but one of your steps is incorrect. Look at it again, take a deep breath and gom
over everything slooowly. If this really doesn't work then Im afraid it's a technician you need :) .

hi! there, since there no model you can relay on this basic set up an old mechanical sewing machine,set your upper thread as shownfollow the red loop thread from sppol to needle,then lift needle cover plate take bobbins and follow bobbins thread directionthreads inside bobbin clockwise rotation when you pull outthe insert bobbin to shuttle race casas shown
hold bobbin like this insert
this to shutttle race case as shown ignore arrow

then
after inseting bobbins closed needle plate cover
manually rorate hand wheel to hook up lower thread bobbin by upper thread bobbin if two thread appear on plate needle adjust tension dial to # 3 to 4 and stich dial to # 12 this for straight stich try sew manually first to observe thread under bobbins if free rotate and no accumulation of thread loop you sew w/ foot pedal or push buttin..happy sewing and have a nice day thanks

Thread test
Test your thread quality to start, thread your machine and LIFT the presser foot (this opens the tension disks). Pull your top thread straight back. If you feel no tension no mater how much thread you pull, your thread is good. If that your machine passes that test, then let me know, we can go to step 2. If not, try different spool of thread, same test until you get a smooth pull (tip: always check your thread this way when you thread your machine)
Step 2:
Pull on your threaded bobbin thread while it’s in the machine. Does it pull smooth and even? If so, go to step 3. If not, try a new bobbin (bobbins get bent or distorted if wound too tight).
Clean thoroughly in the hook and bobbin case area and oil 1-2 drop is all.
Thread knotting on the bobbin can be a lot of things but here's some guidance:
Tension:
If the thread is loose on the bottom of the fabric, it's actually the top thread is too loose. Think of 2 little elves playing tug of war in your machine, one on toip and one underneath. If you have loops on bottom, the top needs to pull harder (tighten top tension)
Jamming bobbin case:
If it is damaged from turning out of place once, it could have rough spots on it that makes the thread hang on it, and keeps making it turn over and over. Use a finger nail board (fine sanding) and smoothall rough spots. Then reset the bobbin case taking care to put the notch in the bobbin case in alignment with the proper spot in the machine (basically 5 o’clock) when looking at the round area where the bobbin case goes.

1. Remove the bobbin case
2. Release the clutch by pulling out the handwheel
3. Draw the thread from the spool andguide the thread throught the hole in the bobbin from the inside to the outside
4. Put the bobbin on the bobbin spindle
5. Push the bobbin to the right
6. Hold the free end of the thread and depress the foot control, wind until full
7. Push the handwheel in (to wngage the clutch)
8. Push the bobbin spindle back tot he left to resume sewing mode.
9. Place the bobbin in the bobbin case (thread should feed clockwise)
10. Draw the thread through the slot in the bobbin case
11. Continue to draw the thread under the tension spring and through the opening Pull out about 4"' of thread
12. Holding the latch open position the bobbin case into the shuttle and release the latch
13. Case should lock into place when released

Hope this helps!

Bonnie