How to fill a bobbin on Virtuosa 150 - Bernina Virtuosa 150

Put the thread spool on the vertical spool holder with a sponge pad underneath. Wind the thread off the spool and through the small wire thread guide next to the spool holder. Take the thread across the top of the sewing arm to the tension unit just next to the gap in the case through which the thread is normally threaded - the tension unit looks like the top of a shiny screw without the slots in it. Wind the thread in a clockwise direction around the tension unit once and pull the thread with a bit of tension until it slips into the sprung gap around the underside of the shiny part. Slip the end of the thread through one of the holes in the bobbin and, preferably, wind a few turns on, then push the bobbin onto the bobbin winder shaft at the right-hand end of the top of the machine. Turn the bobbin clockwise by hand a few more times to make sure the thread is 'locked' onto the bobbin and then just push the lever adjacent to the bobbin winder to the left. To wind the bobbin, you then press the foot controller and either stop when you've got enough thread on the bobbin or let it stop automatically when full. Make sure you dont go so fast that the spool rattles-around on the spool holder otherwise this could spoil the way the bobbin gets filled.