2/ Had never really looked at the chain drive before, other than quickly to grease it once or twice a season. Turns out that there's an idler sprocket / pulley (bc of course there is; you'd need something like that in a design like this to (a) allow installation of chain, and
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3/ (b) to take up slack as the chain stretches. So, loosened the nut, used a mallet to slide the axle that the sprocket rides up up 2", remounted chain, tapped back down w mallet and ...it went a good 1.5" past the old location. Chain has stretched a lot in 8 years!
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