CCVM RC coil lift mechanism

[Sk8brew]

I searched the site and came up empty. Has anyone made a mechanized way of precisely setting the RC coil height on a ccvm? I was thinking of using a linear gear drive or threaded rod or lead screw to be able to repeatedly set and move the coil during the run. The hope is to more precisely dial in the flow rate during the run. I am not trying to automate it, just turn a manual handle or something similar.