My PEEK bearing was loose in the sleeve and gradually eased out and allowed metal to metal. However, all is not lost, now I install the PEEK for cleaning.
I have been playing with the bearing tool and have glued one of the provided washers onto the top side of the handle. So the bottom of the handle has the groove to hold the bearing on removal. And the top with the washer is inverted when you replace the bearing. Looks pretty easy to 3d print.
Ordered a couple of Aroma-2s ten days ago, one of them engraved in my Latin motto. I'll post a photo and you can work it out. It is Yowie season in OZ so take care.