Humminbird Transom mount

My boat has a cheap PiranaMAX 150 LCD depth sounder by Humminbird. A few months ago on a bad launch during rough weather, the transducer mount struck the concrete boat ramp. Needless to say, it broke away from the boat. I tried gluing it back together, with limited success. Since then, I have purchased my 3D printer and whilst out fishing a few days ago watching it flail around behind the boat, the genius penny dropped to make my own! Actually, no it didn't. The first thing was to spend 3