Success, well sort of. The head is now removed from the mounting tray. It took a small screw driver to remove the clips, brute force, a hammer and a long gutter nail (horrors) to remover the mounting shafts.
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See what I found in the innards, thread and broken needle tips.
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Now on to some more cleaning then I will tackle the bobbin case removal. I think I will take a break for awhile.