Last year I only needed the front mount, so I expect that it will be fine again this year with only the front mount.It strikes me that a front mount , has the motor on one side of it , and the spinner and prop on the other side of it , to balance out the forces as much as possible.In other words I have confidence that it will be nice and solid.The 4 metal arms mount to a 1/4" ply ring , with blind nuts installed. It is just a matter of how well it is glued to the fuselage sides . I did build up a fillet of epoxy , milled glass fibers, on the inside.The 1/4" ply mount is actually right across the front of the fuse sides , not merely glued inside the 1/32" ply doublers. Keith