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You shouldn't need to cover the holes. If a shaving get's in, in most likely won't go into your cylinder, if it does.. it still should be traumatic.
If you are worried about stuff coming in, take a normal plug (for putting hose into), stick it in there. Air will still be able to travel out easily and nothing will come in. You don't need a tube either.
If you are still paranoid, stick a tube in it and run it to a shielded place. Or better yet, just shield your solenoid. As Foto said, shop rag, shirt, whatever. When it comes competition time, throw something else over it, or wire-tie the shop rag on.
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