Kenwood Dishwasher Engineers. Is there a knack to fitting Sump Seal?

Hi

Ive been trying to fit a sump seal to a kenwood dish washer KID60B10. Its driving me nuts. Ive been trying for hours. Is there a knack?

Its like the seal is to big for sump but its the same size as original.

I have the sump dropped and just cant get it to fit.

Any help much appreciated.

Thanks