Excuse me, how to open the outlet of Jinghu Lake, what are the specific stresses and knowledge?

Vent hole: Insert the piano rod (burden) into the covered piano barrel, draw a line in the barrel with a pencil, and then take a rectangular vent hole (sound hole) with an opening in the middle as the composite sound producing part of the piano barrel. . Generally, the tuyere of a piano is about 20 ~ 25mm long and 3 ~ 4mm wide. If the sound is not ideal, the tuyere can be lengthened and widened, but the influence of the tuyere on the sound of the piano is limited. Because the tuyere is on the pole below the fifth section, the position of the fifth section has a lot to do with the sound. The longer it is from the "tuyere", the sound will float. If it is short, it will be very stuffy and narrow. If the scale is appropriate (the distance from the fifth section to the "tuyere" is about 7.2 cm), the sound will be crisp and loud.