Bad used part

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09 CWP MS3
What do you do when you receive an item you bought from marketplace, and it has missing and bad parts? I bought an RMM from a forum member, found it to have smashed threads on the bolt and nut, and missing the filleted washer you put on the bushing. Won't offer a refund..I improvised with the installation and hopefully it doesn't come apart.
 
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