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The Activa range is fitted with a light-weight part-plastic hook/shuttle that Bernina claims does not require oiling. However, this does not mean it shouldn't be regularly cleaned and I'd recommend that it is also lightly oiled at the same time. Remove the bobbin case, press the metal lever to the top left of the bobbin door and the black plastic hook/shuttle retainer should pop open so that the hook/shuttle can be removed, or it will just drop out anyway. Use a cotton bud to firmly clean around the inside edge of the hook race (the round piece that the hook/shuttle sits in. Give the whole thing a good clean to make sure any surface grime/fluff is removed. Put a small drop of oil on the running surface of the hook race - the recessed groove around the inside edge, before replacing the hook/shuttle and holding in place by pressing the hook/shuttle retainer back until the securing lever clicks back into place. Rotate the handwheel once to distribute the oil and off you go. Dont overoil but do this regularly and your machine will run much quieter and produce a consistent stitch formation.
Clean the shuttle area, the hook and the cover with a toothbrush, removing all lint and debris.
Place one small drop of sewing machine oil on the rim of the hook.
Place the hook back in the raceway and replace the cover.
Snap the two retaining levers back to hold the cover in place.
Turn the hand wheel until the hook race is in the left position..replace the hook to right side...replace the hook race cover..smooth end to the bottom..and snap back the hook retaining arms...now ready for inserting bobbin case...Good Luck
the hook driver (still in machine) is 1/2 moon shape. The hook is also 1/2 moon shape. If you set the machine on its back, it's easier. Set the hook 1/2 into the other 1/2 of the hook driver to make a circle. Then put the hook cover on (machine still on its back) with the tabs for the twist locks pointed out. Needle gaurd to the top of the machine. Snap the twist locks in place and viola!
The shuttle/race/bobbin system shouldn't really be taken apart by the average user. Unfortunately, your chances of ever getting it back together properly so the machine will sew (this is the timing of the machine) are very slim. You'll need to take it to a sewing machine technician. I would recommend an authorized Pfaff tech as they'll be sure to have the proper tools to do this correctly - won't be inexpensive but will be worth it. Most "neighborhood sewing machine repair folks" don't have experience on computer machines. Resetting timing on a computer machine isn't the same as the old mechanicals and requires some expertise.