We may have found other answers which could help you.
Click here for Needle Thread Foot
thread OK on top but not at bottom?
My new home memory craft 6000 will not draw the bobbin thread up?
Janome MC3000 noise?
how to fix tension?
How to unjam a stiff wheel on a Janome 6260?
manual for a janome model 1312 sewing machine please?