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How old is it? Fans will eventually die. If you notice evil imbalance or struggling noises it may be that time.
That's another reason to be careful spinning up the fan with compressed air. It's okay to do it briefly, with bursts to get out the dust, but you can easily spin them beyond spec and shorten their life.
As for feet, I use self-stick rubber feet from hardware stores. It sounds like yours may be beyond that stage though.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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