What do you think of the Mitsubishi DU-105?

[Zonker62]

The thread comes out of the slit, goes around the bobbin until approximately facing the needle (1/4 turn), and then the tension is so high of course, that either upper thread breaks, either I catch it in time and reinsert the thread into the slit..until next time...
Will provide pictures...

[Wizcrafts]

@Zonker62

I always load my bobbins so they unload against the direction of the slit under the tension spring. That sharp turn adds some tension but helps keep the thread under the spring.

If your bobbin suffers from run-on rotation, get an "anti-backlash spring." Some are round and some are star shaped. They simply drop in under the bobbin and hold onto it as the shuttle spins. They bring the bobbin to a better halt when you stop and start rapidly.

[Zonker62]

Thanks! that's a great idea, and it comes exactly where I thought where the problem was, a run-on or overrotation after a brutal stop which makes some lack...
I'll check where this is available!Thanks a lot!
Now with all this, on the STW-8B, we have lost the Mitsubishi DU-105 subject...:-) 

Edit: "Some slack":