The Pfaff 332 has a stop motion mechanism that is a small knob in the middle of the hand wheel. This disengages the needle and allows you to wind the bobbin without having to check on the material to be sewn. Hold the hand wheel so that it will not move. Turn the stop motion knob counter-clockwise (turn the knob all the way to the left). Put a second spool of thread (of appropriate weight and color) on the right hand pin. Lead the thread from the spool around the thread retainer clockwise. Pull the thread into the guide and then push the thread through the slot in the bobbin from inside the bobbin. Place the bobbin onto the bobbin winder spindle so that the key at the base of the spindle enters the slot in the bobbin. Press the lever into the bobbin. Hold onto the thread end and slowly start to wind the bobbin. After a few winds of the thread, break off or cut the thread that is above the bobbin. Continue winding the bobbin (at any speed). When the bobbin is full the lever will automatically move back to its original position. (If you do not need a full bobbin, move the lever when the bobbin is sufficiently full.) Remove the bobbin from the bobbin winder spindle and cut it free of the spool thread. Return the stop motion mechanism to the right by turning it clockwise while holding the hand wheel.
Pfaff has a manual for the 332-260 on their support page: http://www.pfaff.com/en-US/Support-and-Updates/Support
. The link to the machine page is http://www.pfaff.com/en-US/Support/3421
. The current link to this manual is http://www.pfaff.com/SiteMedia/PFAFF/Products/Machines/Support-manuals/pfaff_332-260-manual-EN.PDF
. See pages 13-14 of the manual for some pictures of the guides and levers.
I hope this helps.