A trick that I use when there are not enough holes for the wires is to drill out the hole to 1 mm and insert two 0.4 mm wires.
Have you ever opened up an old phone that has real bell gongs inside?
I used to be a telephone technician in a previous life. The ringing signal is an AC voltage that causes the gong hammer to alternate back and forth between the gongs. The gongs have a hole that is drilled off centre so each can be adjusted so that there is a small gap between the hammer and the gong.
If you can find such a phone, it may be just what you need. However, note that there is a permanent magnet in the magnetic circuit to act as a bias. You would have to remove this and install a return spring (or possibly mount the unit horizontally so gravity will do the job.
You don't necessarily have to use the phone gongs, only the hammer and coils.