My life-long battle at getting the stem absolutely straight.
Put a broomstick through the front wheel and push it back against the forks, then look down over your bars, line them up with the broomstick and tighten...simples.
@Gav86 started
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Put a broomstick through the front wheel and push it back against the forks, then look down over your bars, line them up with the broomstick and tighten...simples.