The first sign that something is "halfway" with the cylinder is often shown at the most ordinary moment: the key goes in, but it turns more difficult, gets stuck, or asks to repeat the movement. In practice, this is not a trifle, but a warning that the mechanism is wearing out or that the lock has lost its precision. This is especially important for security doors, because the cylinder is not only part of the fittings, but a key point of security and reliable locking of the door.
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