So I want to have someone sabotage a horse-drawn traveling carriage in such a way that the carriage will crash en route and hopefully kill the passengers. I need a type if sabotage that could be accomplished quietly and secretly while the coachmen/grooms are asleep in the same outbuilding where the carriage is stored. But I need the sabotage to be obvious enough to be noticed by the coachman when he inspects the carriage before leaving. My thought is to saw partway through the rear axle, next to the inside of the wheel hub so as to be difficult to notice. Would this work? Is there a better way?