2006 150 Vmax. Part is located on the lower unit directly above the prop. I just noticed there is a big hole there with a bolt hanging down. I looked a the yamaha parts page and am I correct by calling this a trim tab? Is it ok to use my boat with out it....have a tourny this weekend and might not have the part yet. SHould I just go to the dealer to get the part or is there a better alternative online. Thanks