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It is a issue in the component, it happened before where another USB ID for the shuttle was left out of the code and Andypugh fixed the code adding the missing ID. That was 5 years ago. The 011 shuttle ID was not added and is still not provided for in the code even though it is a valid ID for some shuttle pro devices.

Here is where Andy changed the code to add one of the missing USB id's
github.com/LinuxCNC/linuxcnc/issues/702

The shuttle docs list 3 USB codes for use in addding a rule but the 011 code is not mentioned.

For now I connected a shuttlexpress I had and that works fine (its ID is 0020 which is in theShuttle.1 source code)

Do not bother to much with the details for now, assume standard stuff, make some test configs, do some measuring to make sure the axis moves the exact distance as commanded, let it rip!
You can make as many configs as you like for the same machine, you can even edit the scale and some other stuff while LinuxCNC is running and save from there, using the "calibration" from the "machine" menu.
It would help to know the exact screw pitch, so mark the screw and the nut with a sharpie, turn the screw several times, measure, enter that in the wizard.

Google suggests that they are both 1.8 degree (200 steps per revolution) motors, so stepconf's default values should be fine...

Thanks to both of you.Being somewhat impetuous, I put it all together and started tinkering while I waited for advice.... nothing's gone bang. Yet.

Yes: it's a G540. I've just been playing in the workshop and I found the preset for it. Using stepconf, I've been moving the x,y,z and A axes about, like a gleeful child with a new train set!

Sadly, the original computer is now dead and buried. I did keep the hard drive from it, but although I tried connecting it to another Intel motherboard (the original was an Intel dual core) I couldn't get it to boot. Now I think I need to verify the motors. Z and Y use Vexta PK268-02A but the x-axis appears to use an Italian motor HY 200 2232 - 160 88 looks like the model number. I shall have to do some Googling, to find data sheets.

I see a steep learning curve ahead......

Probably a kernel issue, so try installing another RT kernel.
packages.debian.org/search?keywords=linux-image-rt
There are several under the "Package linux-image-rt-amd64" section, try from Trixie and down.
To switch the kernels when powering on/rebooting, hold down the right SHIFT key until the GRUB menu shows up.

Is this the same machine i did reply to with RugBot a while back?
Did you try to find out what he/she is using for CAM? I do recall vaguely mentioning Inkscape somewhere but never checked.
Well id did check now, and it sure does output valid gcode that runs on LinuxCNC without any issues, and changing the scaling in the screenshot does change the angle as it should.
The best thing with Inkscape and GcodeTools is Python, so very easy to edit and modify, i did this for Plasma.