16 tooth sprocket installed. Bolt circle matches up perfectly. Matches chain. However, chain is not lined up , sprockets not lined up. New spacer for gear box is too narrow and old spacer is too wide. Both have an inside diameter of appx 20 mm. Is the best approach trying to find a correct sized spacer, use something like thrust washer with same ID, or grind the larger one / file carefully ? OR is there an option I am failing to consider ?
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