Our company specializes in producing all kinds of precision metal parts injection Speaker: Trough frame, cover, Washers, Copper collar.

本公司专业生产各种精密五金注塑喇叭配件：盆架、护盖、华司、铜环。

youdao

So the means cannot control leak the material, then possibly is the graphite pad or the copper collar wears (for example seal face not to be smooth seriously, gap big).

如此办法不能控制漏料，则可能是石墨垫或铜环磨损较严重(如密封端面不光滑，间隙大)。

youdao

If this means that n acquitted person can ever feel secure from a copper feeling his collar once again, then so be it.

BBC: Brian Sedgemore: Even scum deserve protection