Thank you to all the very kind people who left nice words and helpful advice about how to get my Janome 3018 back into working order. I am very grateful indeed. There were even offers of the loan of a sewing machine. The blogging community is definitely a most thoughtful and generous one.
Anyway, you've done it! Between you all, you've got my sewing machine working again!!
I see now that I may have over complicated the problem a wee bit. In hindsight its a little silly that I took the sewing machine apart. One cheap little bit of metal was the culprit. Yup, it was the bobbin. When I looked closely it was just ever-so-slightly misshapen.
On the bright side I now have a very clean machine and loads of fantastic troubleshooting information for future reference.
So thank you again (at the time of writing) to Mama de Saga, Lisa, Diana, Beth, Big Cat, Sparkly Green Knickers, Cindy, Little Munchkins, Ellieboo, Taccolina, JustJess, Angie and Melanie.
I think my little three-year-old wizard will have an outfit for the kindergarten Halloween party after all! More details and a picture to follow ... after an evening of joyful sewing.