The head on the Arnott spring rotates just like the OEM one. It's a bit stiffer, but that's probably because the seals are new. Other than the air line difference, I found the swap to be very straight forward following the instructions.
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2012 xDrive35d
2001 BMW X5 3.0i 5MT
and two 1987 Corvettes - Callaway Twin Turbo and Guldstrand Grand Sport 80
Block Tester
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