Another problem you'll run into with trolling pins is the tendency for the ring eye in the front to unscrew itself over time. Bowling pins usually come with a 2-inch ring-eye screw, and at higher speeds, these little screws just don't hack it for very long. To eliminate this problem, I replace all of the screws with 4- to 6-inch stainless-steel ring eyes. You can find the longer ring eyes at most marine hardware stores. For an added bit of insurance, I add a dab of epoxy or super glue to make sure they won't back out. As an added bonus, the larger ring eye also adds to the side-to-side swimming action of the bowling pin.