Flexible shaft coupling

[Colapuaky]

Had a rope wrap around my shaft. And it warped my flexible shaft coupling. Got bolts off shaft side easy. Gearbox side has Allen's in line with bolt side off gear box. Have a seperated rib and can only torgue do hard. Cant free up. Question is are these reverse threads? Or is there a trick to these? Cant get socket over bolt heads, have to use an open end. Used two breaker bars and still cant budge. Gonna buy a socket Allen head. Short of cutting it off,does anyone know? It's an orange flex coupling off a 4108 Perkins. Cant figure out how to load pic.