The 2 bolts hold very well indeed. On some planes I needed to mount the tail wheel assembly a bit below the plane to clear the rudder so I make a wood block out of aircraft ply the same shape as the nylon piece. I install the blind nuts and then epoxy the wood piece to the bottom of the fuselage. When the epoxy dries I use a small drill smaller than the blind nuts and drill through the blind nuts into the fuselage so that the bolts can go through without breaking the balsa. Its a bit of work but its worth it. Tip, the Sullivan comes with 2 sizes of springs. Use the larger one for better tail wheel response.