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Re: chain wrap
I believe maximum recommended tension for #25 chain is about 300 pounds. Not sure about minimum, but generally good tension is where you can pull up the chain just slightly (about 1/2" to 3/4" from horizontal depending on length of the stretch of chain) in the middle of the chain stretch. If you're tensioning the chain and you see the links begin to deform at all, it's too tight. Under proper tension, the chain should eventually stretch out and require retensioning.
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