Here’s a neat, easy-to-use tool to help take the guesswork out of adjusting final drive chains. An adjustable stop on the Chain Monkey chain adjuster is set to correspond with one of six different settings for different tension ranges. The tool is then slipped over the chain and the domed rod adjusted to the stop, setting chain slack. Pull the chain tight with the axle adjusters, make sure the wheel is square, tighten the axle, remove the tool and it’s done. $34.99.