Fine Tuners: Make sure your fine tuners haven’t been maxed out and screwed all the way down. Use your pegs for the initial tuning, and in place of turning your fine tuners more than a 1/3 turn. The fine tuners only need to tweak the tuning. Also, some fine tuners when screwed all the way down can damage and scratch the finish of the instrument.
Cello Players: Get a rock stop with the strap that attaches to the chair!
Extreme Cold or Hot Weather Damage: Avoiding possible cracking or warping of the instrument. Don’t leave your instrument in the car for an extended period of time. If you do during the winter, take it into the house/school and let it come up to room temperature keeping the case closed. Extreme heat inside a car during the summer months could cause the wood to warp, and highly expensive instruments, put together with hide glue, can actually melt and you’ll can have a pile of violin pieces and parts.