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The screw that holds the need in place loosened, the needle came down and the machine banged it into the hole in the sole plate. I can't see any damage besides the bent needle. But now the thread is shredding. I believe I might have a burr but cannot see one even when I removed the sole plate. How do I remove the bobbin assembly to check it and make sure there are no burrs? There is a long black metal "finger" holding the bobbin case in place and I cannot get the phillips screw out. Any suggestions.?