I agree with Jonathan, much easier and quicker to do it with a grinder freehand and with a bit of care you won't be able to tell the difference. If you do it in the lathe you will still have to remove the sharp edge with either a file or grinder and flapwheel so some craftsmanship still needed.
Were the Australian bridging disks just flat metal as in the photo above or did they not have a profiled edge like the British ones ?
David
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