Holds the rod directly, so that you can use third party stone holders without needing three hands.
It replaces the original stone-holder holder plastic part, which is clipped on, just like this replacement part.
I printed the part with Esun PETG on a 0.6 nozzle, without supports.
If you use the Hapstone stone holder, be mindful of the screw head colliding with the PAJ PRO angle adjustment knob. I recommend switching it out with a headless screw, or cut the original screws head of, and make a slot in the remainder (it should be easy, as it is made of plastic).
I also recommend getting hold of a fairly long M4 screw to replace the rod end stopper screw. Otherwise your travel will be quite limited. 40 - 50mm are probably good. I have only tested with a 30mm screw.
Alternatively, remove the stopper screw completely.
The sharpener: https://worksharptools.com/products/professional-precision-adjust-knife-sharpener
Hapstone stone holderr: https://hapstone.eu/en-eu/collections/upgrades/products/universal-stone-holders-for-professional-precision-adjust
The author marked this model as their own original creation.