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Periodically check to make sure that the feet of violin or viola shoulder rests have not worn through the protective rubber tubing. Replacing the tubing when necessary will help preserve the areas where the feet contact the instrument. Ideal humidity for string instruments is around 55%; anything below 40% may be cause for concern, although appropriate humidity levels may vary, depending on different areas of the country. In winter, when artificial heat drives down humidity levels, a humidifier is advisable in rooms where instruments are kept or stored, to prevent cracking. Individual instrument humidifiers can also be helpful, when properly and consistently used, during winter months when humidity levels are low. However, if an instrument humidifier is used, make sure to wipe any excess moisture off the humidifier before inserting it in the f-hole.Moisture dripping down the inside of the instrument can cause regrettable damage. In areas where the humidity levels are high, an arch protector can be made to help inhibit possible arch collapse. This small rectangular block is typically made of folded cardboard, faced on the exterior to avoid damage to the varnish. It is lightly wedged under the fingerboard about halfway between the end of the fingerboard and where the neck joins the body (where the arching is highest), when the instrument is not being played. Watch the edges on instruments, especially celli; rough areas or tiny splinters have a tendency to snag on clothing or carpet and compound any damage to the edges or corners. Occasionally check under the tailpiece to make sure that the string adjuster lever is not pressing against the belly of the instrument. Over extension of the lever can damage the varnish and wood. When tuning strings, gently twist the peg inwards as the peg is turned to ensure firm contact between peg and peg hole; this will minimize peg slippage. A good visual image is to twist the peg into the peg hole as one would twist a cork into a cork bottle, using gentle but firm pressure. Each time an instrument is tuned, the top of the bridge has a tendency to be pulled slightly forward (or backwards, when fine tuners are used). Check the instrument each time it is tuned, to make sure the back of the bridge is still perpendicular to the top of the instrument and the bridge feet flush against the belly. Should the soundpost fall, do not continue to play the instrument; the pressure of the strings could collapse the unsupported top. Immediately loosen the strings and take the instrument to a repair person at the earliest opportunity. Should a crack be discovered, or a corner get knocked off, make sure to keep the exposed edges clean, so any repairs can be as unobtrusive as possible. Do not attempt to glue an open seam or crack; take the instrument to a qualified repair person at the earliest opportunity to avoid further damage. Continue