I got this a-line alignment tool in a magazine many years ago and it’s stuck in my bag ever since .Putter by @spoilergolf .If you’re ever struggling with your alignment or you just want something to give you that bit of extra confidence that you are aligning up where you think you are then this can do just the trick .It can be used as a ball marker or a training aid when practicing, you simply point it behind the ball at where you want your putter to be aiming at and then set the line on your pu