ORIGINAL: Mr67Stang
I had this model myself. As stated the wing is bolted to the fuse with the nylon bolts. I flew mine about 10 times but it was so unruly on the ground that I eventually totaled the plane. Sounds like you already bought it so if it is in one piece still... sell it; and get a nice trainer. Just my thoughts. I won't buy another one. By the way I fly other tail draggers and do not have the problems that plane gave me including a Goldber Piper Cub. Good luck.
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No one knows everything, even very experienced veteran flyers.
A specialist in WWI type landing gear set up could have tamed that Decathlon. However, one also has to lead these models a bit by anticipating the needed inputs and applying small corrective amounts of surface input "before" they are obviously needed. By the time you see it, it is too late to apply the corrections.
I learned a bit about this with my first biplane, but I stuck it out until I figured it out. Believe me, that took a while too.