I have a 2007 HPDI with about 8-9 hours on it and I was just outside turning the prop by hand and noticed when I first start to go in either the fwd or rev direction there is a click in the lower unit area. The click only happens once the prop comes to a rest and I spin it again. While it is spinning it appears to be fine. If I take my hand and turn the prop back and forth in the fwd/rev directions I can get it to click with each change in direction. Is this something to be concerned about?