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How are you attaching the bow & stern hold down lines? Looks like you have something fixed horizontally to the front & rear bumpers.
In the rear I used the MINI tow hook that came with the car. Worked perfectly.
In front I used a bolt I bought locally that only partially screwed into the tow hook hole. It unscrewed once and came loose. I couldn't find a bolt that matched the screw pattern and didn't want to pay $30 for a MINI bolt. I did find a MINI bolt on Amazon for $10 that I have on order.
What base rack system are you using? I need to do the same thing on mine.
Yakima Q-towers, Q-128 clips, 48" round bar.
The Q-towers and clips are being discontinued by Yakima and I couldn't find them at local dealers. (Yakima is going to a new set-up that isn't MINI naked roof compatible.) I did find them on Amazon. Bars are available everyplace.
I couldn't find any other solution for F56 naked roofs.