Parametric designs but made from the original .stl, the slider part itself is therefore not parametric sadly.
Remix of the baseplate of this model: Simple yes/no slider indicator - By Tom Price
(@Tommax) - On MyMiniFactory (https://www.myminifactory.com/object/3d-print-simple-yes-no-slider-indicator-126815). Licence as close as possible to his one.
These files replace the “plaque” part of the original model. Please go download the rest of the components at the original model link since, although the author allows remixes, he didn't allow the re-upload of his work on other websites (I suppose this doesn't concern remixes, an upload of a remix isn't technically a re-upload).
Please refer to the original model for additional information. All credits go to the original author.
The author remixed this model.
Two alternative versions of he baseplate were made: One to allow for a magnet to be fitted within and another to allow for this indicator to stand upright.