Kevin , showing signs of wear is normal for anything that is not new - this is not an aircraft . The wear which you want to look for is inside the links where they engage with each other . Gross thinning here is the thing to look out for .
You might try B & G Williams , Garratts Lane , Cradley Heath , B64 - 5RH . They do chain and chain and lifting accessories , and they are in the right town to have the sort of gear which we want . I have not tried them , and would be interested to hear about them .
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