ChenYN Piano Tuner 陈师傅调音—Solutions for old piano tuning pin fasteners

Tuning pin fastener contains glycerin (which expands the wood), resin (which increases friction), and alcohol (which acts as a carrier to deliver the solution into the pores of the wood, where it then evaporates).The practice of using liquid and tapping to adjust pin fasteners is controversial, but many technicians use it and have achieved positive results.

调音弦轴紧固剂含有甘油（可使木材膨胀）、树脂（可增加摩擦力）和酒精（作为载体，将溶液输送到木材的毛孔中，然后挥发）。

使用液体及敲击调校销紧固剂的做法存在争议，许多技师使用它并取得了积极的效果。