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键孔呢的修复是击弦机调整的基础。键孔呢要选用密度大,表面光滑和不易变形的毛毡做材料。密度大可防止胶液的渗透;表面光滑可保证孔呢和销钉间的摩擦阻力最小;不易变形意味着触感稳和使用期长。键孔呢有不同尺寸的厚度,使用前要先放入键孔内测试。键孔呢伸入键孔的长度约5mm。过长,增加了销钉的摩擦力;过短,又减少了销钉的护着面。
Keyhole it is the repair of the action machine to adjust the foundation. Keyhole it to use a large density, smooth surface and not easily deformed felt material. Large density to prevent the penetration of glue; smooth surface to ensure that the hole and the pin friction between the minimum resistance; not easy to deformation means that the touch of a long and stable. Keyhole it has a different thickness, before using the keyhole test. Keyhole it into the keyhole length of about 5mm. Too long, increasing the friction of the pin; too short, but also reduces the nail face.