Monkey diff spring

[lordnikon]

I am just in the process of buildingh a MM kit, come to assemble the diff but the spring is noticeably to large to go into the drive cups. Its not just tight its to large a diameter by some way too.

I cant see an alternative spring in the kit so i am assuming this is the right one, any seen or heard of this before hand ?? Any ideas on how to get this in and compressed ok ??