There were four kindreds of Dwarves somewhere to the East of the Iron Hills. I expect that Sauron may have recruited some of them. However, they did send reinforcements to Durin's kindred during the war of the Dwarves and orcs. Maybe Sauron also had some support from renegade Dwarves of the Ered Luin as resentment against the elves may have lingered from the Nauglamir issue.
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Rumil of Coedhirion
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