I cannot use coincidence mate(between flat surface of the fastner and flat surface of the part) and concentric mate(between round surfaces of fastner and part) to put a fastner between two of the components in the assemly. I solved the same issue with a different set of components and fastners by correcting the sketch (constraining the sketch of the faceface causing problem into vertical), but I couldnt solve the mentioned problem now ? any help ?