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Andrew,
because of the nature of steel you will have to pull in with cables (or push apart with jacks) further than you think as metal will always spring back a certain amount!
If you need to pull in with cables and turnbuckles about 15mm you will have to actually pull in to about 25mm. When you release the cable it will spring back to about 15mm. If not, you will have to pull it in even further. Keep tightening and releasing until it relaxes at the required shape.
Same if you use Jacks. Push out and back repeatedly until the shape is right.
Rather than lifting the dome all the way off try lifting it enough to put long timbers under it.
Last edited by ballaratdragons; 14-05-2005 at 05:52 PM.
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