Pick a spot in front of the ball and send your HANDS directly toward that spot (aiming point)
I'd just like to add here that for me (and I may be way off track) it has helped to aim the hands more with the feel of at or even behind the ball. This came from watching Yoda's excellent video on the straight line delivery path. Note how the dowel parallel to the right forearm arm angle of approach is back towards the ball. If I try to get my hands too far forward I seem to get more of a circle delivery path (possibly roundhousing too), for me better results come from going down steeper through the ball. Perhaps this is just my problem though.
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