Hyundai 18817-11051 Plug Assembly-Spark

You can use a short piece of rubber hose to aid in alignment and prevent cross-threading.

Here are the steps to follow when removing and installing spark plugs: Allow the engine to cool. Inspect the new spark plugs and adjust their gap as needed. Remove the spark plug cover to access the plugs. Remove one spark plug at a time, and if necessary, use compressed air or a bicycle pump to clean debris from the spark plug hole. Thread the new spark plug into place, and tighten it with a torque wrench or ratchet. Inspect the spark plug wire before attaching it to the new spark plug using a twisting motion on the boot. Repeat this process for the remaining spark plugs, replacing them one at a time to avoid confusion with the wires. Optionally, apply a thin coat of anti-seize compound to the threads before installation to prevent thread damage during future removals.

You should not attempt to adjust the gap on these spark plugs, as it could damage the plating on the electrodes.