Chief if you have access to a 3 D printer, there is a chain alighnment tool easy to print that you fit about 18" of 1/4" rod into the tool and it clamps onto the rear sprocket and you adjust the back wheel so that the 1/4" rod lies exactly the same as the chain. I think it was posted by somebody on this forum and can be found on this thingiverse of things place for 3 D prints.
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