SOURCE: bobbin case retainer popping out on Singer Touch & Sew 625
Take the bobbin case out. Then when you go to put it in, realize there are 2 ways to get it. You have found one way. The other way is first look in the the slot with a flashlight before you insert it. There is a flat piece of metal the bracket needs to be slid under as it is inserted. This acts like a spring making it tight
SOURCE: bobbin case is popping out, and machine is birdnesting
Usually when this happens the bobbin is in wrong, replace it make sure the thread is going out the right way, make sure there is no lint or small pieces of thread around or underneath the bobbin area. Make sure you thread it with the foot up. Also make sure you are usng the right bobbin for the machine. They can easy get mxed up.
SOURCE: The bobbin case on my Singer Inspiration 4210
From what I gather on other sites, your thread has to be threaded under tension.... You have to make sure you hear a click when your bringing your thread down to the bottom of the "arm". Also, I thought the bobbin case was rather loosely held in its place, I adjusted this by unscrewing the black plate and moving it over just a smidge. The bobbin is supposed to have some wiggle room, but it kept popping up and making the tiny adjustment seems to have done the trick....for now...
SOURCE: The bobbin case on my Singer Inspiration 4210
unscrew the black plate that holds in the bobbin case and move it over to the left just a little bit, but make sure there is still clearance between the lower right corner of the case and the plate. The case should be able to wiggle a little, but not so loose it can pop out..
SOURCE: how do i replace the bobbin case in singer machine
When you insert the bobbin case, make sure the "knub" on the bobbin case (#1) is just to the left of the position finger bracket (#2). It should sit in there nicely and you should be able to spin the hand wheel freely. 
Let me know if you need more help,
Chris
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