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You can build from source by following the instructions here:

github.com/LinuxCNC/mesaflash

As for the Linuxcnc version I doubt whether 2.1 could be built on a recent linux distro due to python issues.

This should work for 2.8 and up, notice the hal command at the end for refreshing the Gremlin (plotter).

Not sure where you got that information from but I don't see an 'axisui.refresh' pin:

 

i did some rework on the mounting for my air cylinders and have been getting stuff gathered and sorted for driving this chuck while i have been working on the clamping needs for soft jaws for this thing. i did some testing to see how good things will center and with out to much effort i looks like things will at least be within .015 off center at the worst 90 degrees from the air cylinders. centering and around .005 off in the line of the two air cylinders. so things look promising so far.

I'm not sure what would realistic since stock tubing is not going to be perfect to begin with but i have one last thing to try to see if i can get things in line better to get as good as i can get and produce repeatable results every time. If i can get within .005 of center all the way around i don't think it's going to get much better than that or at least on a repeatable level.

accurate clamping and centering will open up better options for programming a rotary, so this is my end game. i also think once you add a second chuck that will help quite a bit as well.