Hard contact is not necessary, it only results in excessive ware. They should however make good contact the flywheel. The flywheel must be clean, dry and smooth. Two flats on the cam enable the points to fire every half revolution. The "Brushes" short out the non-firing spark plug wire acting as a distributer. All insolation must be clean and dry. While the flywheel is off, check the spark plug wires for shorts to ground. Like any distributer, they can develop carbon tracks to ground. They are hard to spot and look like cracks. They may have a high resistance, but are still less than that of the spark plug and will be a disaster for ignition.
Good Luck . . . . 🙂
