The assumption is that you have your own machines on which to experiment, or helpful friends with machines. Please do not send Templot files to commercial laser cutting or 3D printing firms while this project is still experimental, because the results are unpredictable and possibly wasteful.
Here is an interesting page of photos and drawings about the working of the Wynn-Williams ground lever boxes. Each time the lever is pulled it toggles the points to the opposite side, and then springs back:
The small print:
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