I am taking my Utrex in for repairs and need to get it off the boat. Figured I would just pull it out of the mount. Easier said than done. I have removed the black 1/4 Allen head screw from the top of the mount and have deployed the trolling motor so that I would be as if it were in the water. I figured the Ultrex would just slide off at this point. It is as tight as a jug. I have rapped it a few times with a rubber mallet, but it isn't budging. Am I missing another bolt? And advice?