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mrJL-
Worse comes to the worse you could use anything that will take the bolt through the middle of it and apply load to the top of the stem and whatnot. Then remove it when the stem bolts are tightened. Just be super careful with the stem bolt torque as there will be less bracing the steerer from the inside.
Sheldon also reckoned you could preload by force using your own weight although I've never managed it but I'm a 60kg weakling
Howard
can borrow mine if you want and are desperate to ride tomorrow. would like back before weekend though :-)