I have the bernina 630 I took the bobbin and hook out to oil the machine now I cannot put it back when I try and it pop out it will not let me sew please someone help.

Not real helpful now but I take pictures of each part as I take something apart. Search your machine number and see if there is an on line manual. You can make the page larger and see better details if on line.

This happen to me once with my old machine. Usually the instruction books are very good as they show enlarged diagrams. I have Bernina machines and the instructions are amazing. Hope you manage to fix the problem. Sarah.

The YouTube video should show you what you need to know.