Some racquets feature a trap door on the buttcap to allow easy removal of drill flash.
一些球拍有一个可以打开的手柄底盖，它可以容易的清除拍框内 侧残留的钻孔碎片。
2
As he gets ready to unleash on the ball, Djokovic points the buttcap of his racquet toward the other side of the net.
当他准备好击球，德约科维奇的拍柄指向球网的另一边。
3
Shock eraser insert: thermoplastic rubber core inside a thermoplastic elastomer buttcap is pressure fit into the shaft to reduce frame shock and vibration.