My friends and I acquired 3 links off of the an old chain lift from the Blue Streak at Conneaut Lake Park. We asked the park mechanics that were helping us paint the coaster because we had noticed that the pieces were just laying on the ground getting rusty. They told us we could have the pieces we wanted and anything else that was laying around on the ground(nuts, bolts, screws, etc.) but we only took the chain links.
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mmm, roller coaster
(Homer Simpson)