Starbuck's wrote:
I use them to stop the screw pin from unscrewing from the shackle. I put
the zip tie into the hole in the screw pin and the link of the chain. It
stops the screw pin from being able to turn.

Here is a picture of the shackles and screw pins.

http://www.labsafety.com/store/produ...&parent_id=118

I probably still have a small roll of galvanized wire kicking around for
that purpose.