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So after doing a little research, curiosity got the best of me! You can stud weld to aluminum, however it seems it’s also common that they use hot glue to adhere studs to the metal for pulling as well. Watched a video of someone working on an Audi with an aluminum door, they had like 10 of those pins maybe a half inch apart and a special bridge type tool to pull on the pins. Seems fairly effective, also he was heating it with a heat gun while pulling on it.