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I was pulling the float bowls off a bank of carbs the other day and the phillips bowl screws were stuck. Rather than risk damaging the heads beyond repair, I immediatley stopped trying to loosen them and got out my trusty tube of Permatex valve lapping compound. A little of that on the tip of the screw driver and I was able to easily apply enough slip-free torque to get the screws out undamaged. Thought I'd share this technique I've been using for years. The lapping compound is readily available at any decent parts store.