Obviously I defer to the Dad-In-Chief, Plankton, but I don't think you need worry about a spark plug shaking loose. Put it in tight with a spanner and it'll usually stay put. As for the plastic sleeve (or in your case, a metal cylinder?) at the end of the elec cable, if that does pop off the spark plug for some reason, (i) you should know it immediately by the sound of the engine not firing regularly and (ii) it won't do any damage; just push it back into place, but harder.
That's what I'd do on the kind of old car I'm familiar with, but I've never looked under the hood of a KIA, so follow P's advice about that fancy bolt that's sheared off.
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"Am I enjoying this moment? I know of it and perhaps that is enough." - Sybille Bedford, 1953
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