So I took 3 sockets: an 11/16, a 13mm, and a 7/16, put a 3(ish) inch bolt through them (with some washers inside the 11/16)and a nut to hold it all together; makes a pretty good model of the shaft. Slotted it in while tightening up the cover plate and it did the trick. If people are interested I'll have a go at getting a picture or two up.
On a side note, changing the clutch cable is a right cow!