Seems I broke my Juki-LS-341, again... (Bobbin Shuttle)

[AlZilla]

I can't get that video you run this morning but it sounds like you're talking about what I would call the "case opener". A finger that contacts the bobbin case at exactly the right time and pulls it counterclockwise (in my machines) to be sure the needle thread clears when exiting the tab area under the needle plate The tab keeps the bobbin case from spinning around. 

If the machine is sewing, it can't be too far off. If the opener was holding full pressure all the time, the thread would hang up on the side where it enters there tab area.

That said, it should have some float - I could see it accelerating wear on some part if it's under even slight pressure 100% of the time.

On my machines, the case opener finger itself has a slot on the end, where it screws down. I think there's even a spec to set the clearance.

I know that doesn't tell you exactly what to do on your specific machine, but the concept is the same.

Unless you're not talking about a case opener. If not, ignore everything I just typed... 😃

[Wizcrafts]

3 hours ago, Yoshi888 said:

Also not sure it is completely the right term but it's whats referenced in the manual. 

It is the part on the bottom left of the video that holds back the thread after the hook released it across the bobbin. 

To my understanding it should be kept there a bit longer so it does not get entangled with the bobbin mechanism.

But currently it basically releases the thread instantly after it passes above the bobbin case. 

That part is known as the "latch opener." It should be set to pull back on the bobbin case as the thread goes around it, then let go  after the thread knot is pulled up past the notch in the throat plate. There is a small amount of wiggle room in that cutout for the little tab on the bobbin case/shuttle to move forward and backward. Pulling it back at the right moment frees the thread to go up without hindrance. It should not be set to pull back hard against its stopped position. Leave a tiny amount of clearance at the pulled back position so you don't break anything or wear out the pulled parts.