I have this coupler on this homemade trailer I bought. I have put alot of money into this trailer, and this coupler is keeping me from using it. I bought a coupler repair kit thinking this would solve the problem but it didnt. the original coupler had a straight flat peice of medal going from the hitch down to the semicircle peice that holds in the ball. Does anyone know where i can get a coupler kit for this, or any ideas how to repair it cheap?