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#25 does the job
although we stopped using chains three years ago in favor of spur gears, when we did use chains #25 always did the trick. we never had a failure in either drivetrain or arm design, although i have seen #25 break under periods of extreme stress, i.e. when lifting a heavy arm or supporting loads greater than 50lbs. good luck.
Anthony Lapp
lead design
team 221->857
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