Amateurs are often poorly positioned to diagnose problems stemming from floor sweepings, parts recovered from e-waste, cheap knockoffs, or outright counterfeits

Amateurs are often poorly positioned to diagnose problems stemming from floor sweepings, parts recovered from e-waste, cheap knockoffs, or outright counterfeits. eBay parts not in those categories are often free samples you can request yourself. Paying a premium for a new part with predictable characteristics isn't always a mistake.