Clutch fork won't clip back in.

Hi guys,
I have just installed my new clutch and 4 speed.
I'm trying to put my clutch fork back in , so I slide the T/O bearing towards the clutch but I can't get the fork in either the spring clips on the T/O bearing or the locating tab on the bellhousing ??
Do I need to unbolt and move the box back off the bellhousing . I'll try get some pics up.