I have two Sebenza 21s, one was made in 2014, the other 2015. I cleaned them both last week and noticed that the earlier knife's stop pin sleeve has two grooves in it, and the newest one was smooth. I did a search and read something about the grooves having to do with keeping lint from interfering with the knife's operation. I checked a third Sebenza, a friend's made in 2015, and it also has a smooth blade stop pin sleeve.
Do all Sebenza 21s now come with smooth blade stop pin sleeves?
Do all Sebenza 21s now come with smooth blade stop pin sleeves?