I have a Janome from New Home my bobbin and case will not stay in the hook race even with the holders in place

SOURCE: Janome memory craft 5700, purchased 2004

Take out your bobbin case and examine it for nicks, scratches and or rough spots.If the problem is not too bad it may be possible to buff out the bad spot with an emery stick or emery cloth. If that isn't possible or it makes too much noise after you buff it you will have to replace it. Look especially along the edges and underneath.
sewman7

SOURCE: bobbin case does not stay in place

I looked at the 4210, here http://www.singerco.com/accessories/manuals.html

And I do not see any adjustment. Refer to the page for installing the bobbin - are you using the right size bobbin?

Iron

• 3018 Answers
• Posted on Jun 12, 2011

SOURCE: The bobbin holder is coming

• When is the last time you have changed your bobbin? They do go bad and when they do it can cause a world of headaches and problems. Bobbins come in several styles and makes from wood to metal to plastic and are not always so universal. I suggest to change the bobbin with the exact same style as the one you are using and see if this helps.
• Wind the bobbin with fresh thread.
• Also remember that while cheap thread is cheaper it will shred, rip and jam more than it will stitch. I am not saying you are using cheap thread but just a reminder in case.
• If you have any questions or comments please feel free to ask.
• Thanks for using FixYa.

SOURCE: There is a noise when I sew in the bobbin case

Sounds to me as though you're not pressing the hook retainer back into place properly, or that the spring retainer is not properly engaging with the metal 'pip' on the left-hand-side of the 'U'-shaped hook retainer. You should press the hook retainer back until there is a definite 'click' and you should see the spring clip on the left just move a little bit when it clicks. You definitely shouldn't be able to 'loosen the hook race cover' at all - if you can, the hook will be able to rattle-around in the hook race causing noise and (probably) inconsistent stitch formation. The other thing you mention is that you 'cleaned-out' the hook race, but you didn't mention oiling it. If your machine has got the lightweight hook/shuttle that is black plastic with a metal hook around the outside, Bernina claims these dont need oiling, however, I've found that a small drop of oil will improve the performance of these machines immensely (note a SMALL drop of oil !). If you have an all-metal hook, you most-definitely need to oil it after cleaning ... lack of oil is probably the biggest cause of noise in machines of this type.

SOURCE: bobbin case wont stay in place

the bobbin case may need to be replaced. it wouldn't hurt to have the machine serviced to make sure the hook & hook race are ok