That's not just a screw. It is attached to stuff inside and the ALDA will break and be rendered useless if you turn it too far. Pictures of the inside of an ALDA are here, courtesy of gsxr.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References