The large silver ring on the end of controller plug? Those breaks off easily and putting it on is no guarantee the controller will work because it serves an important connection with ground and shielding.
Your best bet is a new 8 pin DIN plug (2 different styles, get the one that looks like C rather than U), cut off the old plug, and wire the new one in. Be sure to check wiring that they are in correct order and the shield ring is also connected.