Sealed glass opening behind the door body without problems, but depending on the size of the dent shape, it may be better to use an adhesive remover kit. Since it is quite difficult to use for a beginner without training and experience. It's like driving blind. I think the lighted scoreboard will help you see where you are clicking but I didn't go that route as my car is brand new and I don't want to screw up and create more problems than I started. There is nothing wrong with these tools, they are nice and compact, they are perfect for small repairs.
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