Originally Posted by
Cari-in-Oly
Besides all the other answers, I've thought of one other thing. Twin needles come in different widths(space between the needles), are you sure you're not using a twin needle with too large of a width for that machine? Or a size too small for the fabric being sewn? Either of these can cause a needle to break easily.
Cari
I didn't think of that, Good catch, you might have just figured out the best solution. Brilliant. Sew on with your copilot.