The CSM designed by Rkstar42 does not have a holder for a counter but this design by Joshua De Lisle does.
Print the file digital_counter_holder.stl then one each from this model.
I've attached mine with double sided adhesive tape. Or use glue or for the plate there are screw holes.
Placement of the two are dependent on working direction and cylinder markings. I work clockwise and start at 3 o'clock on the cylinder. And it can count rows for heels/toes worked on the front but not great on the back.
To manually count rows; pick up the magnet with a tool and swipe it, then put it back.
The author marked this model as their own original creation.