I'm NOT a professional but sometimes I need to remove worn screws in my garage. So far I've had two cases (one screw countersunk in wood, one in aluminum) where this particular removal set was needed with the screw head removed. The most important thing to remember: don't rush. I have found that in the second step, when the mating thread is screwed into the cleaned head of the screw, a hand screwdriver is significantly better for me than a power tool. if you don't move so slowly, you take everything off again. In terms of quality the kit has held up so far and the biggest challenge is really learning the right techniques and tricks to make it work. I can't remember if the instructions were included or not (I can't see them this time), but there's Google and Youtube for that.
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