On the Apex Pro, it is the pivot block that moves up and down so you put stone above the stop (between the stop collar and the pivot block).
With the Ruixin, the pivot block is fixed on top of the rod and the whole rod moves up and down so you use the base as reference and place the stone below the stop collar.
Place the first stone you use on top of the base and than fix the stop collar so it rests on top of the stone.
For other stones you than raise or lower the rod so the collar again rests on top of the stone.
Here is a photo of my Ruixin as it is now, also modified with a ball joint rod end which is a lot more precise.
Frans
With the Ruixin, the pivot block is fixed on top of the rod and the whole rod moves up and down so you use the base as reference and place the stone below the stop collar.
Place the first stone you use on top of the base and than fix the stop collar so it rests on top of the stone.
For other stones you than raise or lower the rod so the collar again rests on top of the stone.
Here is a photo of my Ruixin as it is now, also modified with a ball joint rod end which is a lot more precise.

Frans
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