Sentence:  Here, with the log cars tilted, the <WSD>togglers</WSD> on the retaining chains were released and the logs rolled off the bunks, bounced against a heavy post that spun them around 90 degrees into a chute, down which they slid into the water. 
Meaning of the word marked with <WSD> tags:  A type of fastener that has hinged wings that spread to provide a surface against which the fastener can be tightened (e.g. a toggle bolt).