Seizing shrouds to spreaders

[Ryan]

Looking through the archives Brion mentions that you seize the shrouds to the spreader for vertical and lateral security. In regards to vertical security, it seems that you need to tension the shrouds before you lash then to the spreader tips so that subsequent tightening of the turnbuckles don't actual pull the spreader tips down. Is this the case or am I over thinking (again!) this?

[Russ L]

Hi Ryan.
Over thinking is not a chararter flaw. Being under cautious is a flaw.
My normal practice is a dockside tune and temp sieze the spreader ends. This takes out the constructional strech and most of the tuning stretch. After an on the water tune, when at dockside check to ensure the spreader tips are at the proper elevation and put on the permanent sieze. Any subsequent tune will not have a material effect on the spreader position.
Cheers, Russ

[Brion Toss]

Hello,
It would be more direct to figure how much the wire above the spreaders will stretch, and compensate all at once. On a double-spreader rig, the amount verges on the trivial, especially considering that the downward vector on the spreader doesn't kick in much until the angle is several degrees from ideal.
Fair leads,
Brion Toss