Focus rail

The Focus Rail
The focus rail unit (my Novoflex Castel-Q which is shown in the pic) simply allows the entire camera/lens combo to be moved, back and forth, in small, smooth, incremental steps, ...

focus rail
focus screen - it's a common focusing method for plate cameras to put a satinized glass plate into the camera's back instead of a film plate.

Great article with a new concept for macro. With holding focus critical, I would use a focus rail in addition to the tripod.
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You can buy convenient adjustable rail systems (macro focus rails with one or two rails) that slide the camera back and forth for this type of precise macro focussing.
When you're dealing with closeup work the tiniest motion is magnified.

See also: Hood, Landscape, Memory, Sensor, 35mm equivalent