It's a reference to the barriers that built up between the band members over the years and everyone's desire to tear down the obstacles and heal old scars.

其实这句歌词寓意很深，暗示着乐队这几年来遇到的不少障碍，乐队的成员们都渴望着能拔掉这些钉子，让旧日的伤口早日愈合。

youdao

Mingus would tear his compositions apart and reassemble them, much as he did his band, the Jazz Workshop.

WSJ: Mercurial Charles Mingus | Mingus Ah Um | Masterpiece by Eric Felten