Originally Posted by smudger1
Depending on the severity of the tramping , particularly from a standing start - without ATB’s you are in danger of overstressing the springs & taking the universal coupling at the rear out of its angular comfort zone. Bear in mind MMC haven’t got the best reputation for the quality of their leaf springs

In the end I reinstalled the ATB with the replacement zonking big bolt (thanks to Rutter's). Not an easy job. Can't say as it has made any discernible difference, but it's now back together the way it left the factory. At least I now know what the markings on bolt heads mean https://www.aftfasteners.com/grades-of-bolts-bolt-grade-markings-bolt-strength-chart/

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Peter
2009 3-litre Roadster "Ivor", royal ivory / green