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Like the rotisserie guy on TV, "Set it and forget it." No twisting is necessary. I have the rectangular BMW ones, look great, work well. The only problem is an occasional parking lot driveway that goes up and then down, like a hump, but crested/pointed at the top. have heard a little scraping, no harm done.
A note about towing, any C6 should be held on the flatbed with wheel straps not through the frame. The problem is that most towing companies do not have the straps either due to cost, damaged or lost. Try to confirm this before the truck comes. This information comes from AAA's towing guidelines, so AAA should back you on this.
I'm no expert on towing but the two times my C6 was put onto a flatbed tow truck, they secured the vehicle by J-hooks in the frame slots....one truck used one wheel strap in conjunction with the frame slots but the other truck only used the frame slots (I understand the frame slots are actually used at the factory to move the entire vehicle around during production).
I was under the impression (from reading many other posts) that the preferred way to secure a C6 for long distance trailering was to secure the vehicle with T-hooks or J-hooks into the frame slots ....the tie-downs secured in the criss-cross "X" pattern (and possibly augmented with a couple wheel-straps).
I recall debate on whether or not to rachet-down the body to compress the suspension so as to prevent a shifting load. I also recall someone mentioning to leave your ACC on with the F55 suspension to keep the suspension active, however, I don't know how this would work with long distance trailering. I can't imagine C6s with F55 suspensions shipping from the factory with all the ACCs left on.
I could be wrong (I often am) but I'll go back and search out some old posts and check the FAQs....I thought for sure using the frame slots was the preferred way to secure a C6 for towing.
I put small brass screws in the ends of the pins before I pushed them in the puck. Just in case I ever have to remove the puck, the screws give me a way to pull the pins.