求翻译：We fabricated a Z form of stopper (see attached picture with the installed fabricated stopper) out of a 3/8 “thick plates and drilled an 1” hole and fastened it together with the retaining plates to hold the drum back from going somewhere else, after we pulled back the drum in its place by using two bolts that serves as puller and re-tighten up the retaining ring.是什么意思？

待解决 悬赏分：1 - 离问题结束还有