I'm curious if the machine stitch length indicator ever matched the number of stitches on this machine. Would this series of machines have been that correctly calibrated even from the factory? I just picked up a 403 recently and now I'll be curious to check when it makes it to the top of the pile. And I was looking at the tensioner on it and I'm not sure I would take it apart, unless there's something in the manual showing how to do it.