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Sounds like you are describing the hook. Perhaps the owner's manual would be assistance. We don't know the make/model of your machine so are really unable to help. There are some videos on YouTube that show how to install a shuttle and bobbin case, but machines differ.
If you are inserting the shuttle and locking it in place but the needle continues to hit, the needle may be bent. If a new needle is installed and it continues to hit, most likely the needle/hook timing is off. Take it for service.
HINT: before you install the shuttle, make sure to place a drop of sewing machine oil around the outer edge of the shuttle and lightly spread it around the outer edge (you should do this about every time you change a bobbin). Sorry, you'll probably need to be familiar with removing and installing the shuttle. Have patience! Once you've done it a couple of times, you'll wonder why it was so difficult.
It usually helps if you can tilt the machine back about 45 degrees so it is supported by something (pillow, cushion) so you can get good visibility into the bobbin area.
Raise the needle so that the take-up bar is at its highest point.
Make sure the outer hinged door on the shuttle area is open. Inside that open door is a metal unit that is shaped like a "C". The shuttle makes up the other part of the "C". The two C's face each other and complete the circle. Grasp the shuttle by the projecting bobbin pin. (Perhaps the photo & videos will help you in placing the shuttle (you'll probably need to wiggle it around a little until it pops into place.) Once the shuttle has snapped into place and you've closed and latched the outer cover, you can install the bobbin case.
Bring it in for service, if you do the repair and do it wrong (and you will) then it could cost you hundreds of dollars to replace the shuttle. Pay a little now, or tinker with it and pay a lot later...
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.
In the shuttle area there is a silver round piece- called the shuttle
race cover. It has a black ear on the right and a black ear on the
left. Push the right ear to the right, and the left ear to the left and
the silver ring should come out. Behind the silver ring is the bobbin
case stuck in the hook. Remove that, jiggle it, move it, just work the
bobbin case out of the hook. Now put the hook back in the machine. In
the machine there is a driver that looks like a half moon. Your hook
looks like a half moon- make a full circle out of both of them.
Re-install the race cover, pushing the left ear to the right and the
right ear to the left to secure the race cover, and your problem should
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 hook will be covered by a plate called the RACE. Its a flat steel plate that sits over the hook and is snapped in place by 2 black coloured snaps.
Looks like you are trying to operate the machine without the race on. try that and it should work.