I just purchased an Ultrex to replace the Ulterra that was on the boat when I purchased it. The old mounting holes do not line up, and the wiring holes in the bow are not big enough to get my hand through to access the area underneath the gunnel. Are most of you using threaded inserts to attach your trolling motor? Has anyone opened up a hole in the bow large enough to get your hand into the gunnel to attach standard nuts?