I recently ordered a MSK-250 for my older Tormek 2000 (2006 vintage) unit. The replacement shaft is about 1 inch shorter in length than my original shaft. When the leather drive wheel is secured to the new shaft there aren't any threads exposed when the SG-250 stone is attached to the other end. I wonder if I got a MSK-200 shaft by mistake. I've attached a picture to show the differences. I purchased this via Amazon 2 months ago and due to work issues I was unable to attempt installation until this last weekend. If the part was just put in the wrong box I would like to exchange it for the correct part.