Proboat UL 19 set up tips. COG, Strut and turn fin 

Your welcome brother. Glad to be able to help you and the hobby.

mounting it inside of the mount. This puts it in line to the outside edge of the sponson and 2nd mount acts like a supporting brace from the fin bending outwards. More surface area from the mount.

Thanks. I used popsicle sticks and fiberglass resin. Then sanded flush. If you scroll through my videos. I have a full build series on this boat.