Attempting to replace a spring on a strut as the old one snapped, the car is a 1.8 Focus mk1 and my brother bought the spring from a local motor factors. When i compress it no matter what coils i put the compressors on it just doesn't compress the spring enough to bolt it back together so i'm really stumped here?

I'll put a picture on so people might be able to see the issue, perhaps been sold the wrong spring?