Harvesting tools themselves do not increase your chance of getting a rare. Because they increase your speed, you have a better chance of harvesting more nodes in a harvesting session, and therefore getting more rares.The tinkered tools do increase your skill. There is a skill-over-trivial point where the odds of getting a rare get better if you're a certain amount over the point for that Tier, but you're looking at a pretty limited set of circumstances where that'll work for you when harvesting tiers below your skill point.
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