there must be something useful in anything broken or disused (slang)
Definitions (粵典–words.hk)
語句
形容一個人或者組織,就算遇到難關,都仲有一定嘅實力 (of people or organisations) even after meeting with a disaster, one may still have considerable power; literally: a wrecked ship leaves behind three catties of nails / nails of 3/10 of the length
嗰間大集團爛船都有三斤釘吖,冇咁易執笠嘅!
𠮶间大集团烂船都有三斤钉吖,冇咁易执笠嘅!
go2 gaan1 daai6 zaap6 tyun4 laan6 syun4 dou1 jau5 saam1 gan1 deng1 aa1, mou5 gam3 ji6 zap1 lap1 ge3! That corporation has still got considerable capital, it's not going to fold so easily.
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爛船都有三分釘
Definitions (Wiktionary)
proverb, Cantonese
No matter how bad something is, there is still some value in it. (syn.) 爛船都有三分釘, 爛船也有三斤釘, 烂船也有三斤铁, 烂船也有三斤钉, 烂船都有三分钉, 爛船也有三斤鐵