Well I think I have broken my Juki already or I am just doing something really stupid. While trying to sew some leather this morning, I noticed the needle snapped off and that the wheel would not rotate completely around. I think this small shaft with arm curved arm on end is called the "opener" which looks to be keeping the casing that holds the bobbin assembly from turning. This shaft is very tight and doesn't move. When the hook starts to turn up this arm in the top photo hits the metal