On my cello, I was trying to tune the C string with the fine tuning screw thing, I was tuning it down and noticed the pitch wouldn't go down, it would stay the same, than I kept tuning it down till the piece of the screw fell off, than I rescrewed it in and tuned it up, it will tune up but for some reason when I tune it down it wont tune down and if I keep going the screw falls off. How do I fix this?

trade the cello for a keytar.

someone on KR has a cello!?
this is like getting a prophecy from jesus.

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i am so vain. and yet, so masochistic. how can the two coexist?
-francesca woodman

I'm not talking about those tuner things on the top like a guitar. I'm speaking of the screws under the bridge.

Moving the top pegs on the cello even the slightest bit will raise the pitch about two-four semitones. So yes it's very necessary.