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Kerrowmoar TT Milestone Joe Thornton, a TT rider and antiques dealer from York, painted the ?K? on the tree just before the left-hander at Kerrowboar to warn himself of the protruding the kerb on the left. The ?K? is touched up on a regular basis and has been a life-saver for many riders. The fastidious rider made marks throughout the entire course. Rachel Clegg pays tribute to this moment in Isle of Man TT history with this eye-catching photo, as seen in her TT Milestones 2013 calendar.