Sewing machine stops after few stitchesstrikes...

Question

The bobbin case got all jammed up with thread one day and I had to pull and cut it all out. I was careful and did not damage the compartment in any way....or so I thought.

Now, I can only sew a few stitches and the case stops going around and the needle is striking metal and stops. I align the metal part that goes around by pushing it clockwise just about 40 degrees and it works again for only a few stitches and repeats the problem.

What have I done and can I fix this problem?