This sounds like there is a dead spot in your starter. The easiest way to resolve this issue is to replace your starter. Many times, if you take a lot of short-distance trips over the life of your car, the wiring inside the starter itself will wear (short trips means starting it more often, causing a lot of wear over time). Then the inner wiring of the starter wears too much, it forms a "dead spot" -- when the starter is stopped at a very specific spot i will not form the magnetic force needed to torn the starter motor. This is a common issue which can be dealt with for a time if you have to save the money to replace the starter. Tapping the starter, or arcing it with a screwdriver makes the inner workings of the starter jump a little, allowing it to move out of the dead spot and kick over as normal, but it is only a temporary fix. Unless you refurbish electronics for a living, it is very unlikely that you will be able to repair the starter on your own, and such a repair takes some time, so you are better off to replace it than try to repair the starter itself.
As long as the starter does not happen to stop in the dead spot, it will work as normal ... but in time the dead spot will spread, causing the issue to worsen. You can keep forcing it to turn with the two tricks you used until you have had the opportunity to earn the money to replace the starter (or until you have a day off to get the repairs done) .. but over time this can cause more damage to other parts of the car, so I recommend replacing the starter as soon as you can.
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