Lost screws will mean lost keys. If the screw is too far out, tighten it with a small screwdriver until it is level with the post, but do not overwind the screw, as the important thing may bind. If unsure, seek out a professional repair person to fix, maintain and adjust screw tensions. Wooden clarinets are often discipline to cracking, a condition we all hope to circumvent. Cracking can occur if part of the wood absorbs moisture and expands while other sections are too dry; the difference in pressure can cause a crack. The same can be said of temperature. If you blow hot air through a cold tool, the temperature difference can cause the bore to expand while the outside continues to be cold and shrunk. Either way, the force on the wood is inconsistent, and cracking is feasible. For this reason, never use a wooden instrument on the marching field. However, don’t panic, as cracks can be repaired. Wood is a cloth that adjustments over the years and with fluctuations of humidity and climate.