Unhappy buyer .What to do ???

Read the ad,, seems up and up,,, good price too,.. he got a deal,, and without using it,, I can't understand his complaint, unless there's chunks off the teeth,..

I'd want pics, and reasons why.. if I responded at all..

Interestingly, I just purchesed a set of gears from a member,, used,, and when I install them,, if they're noisy,.. I won't say a word..,

If there's chunks off the teeth,, I likely will...