Jonathan,

I used these: http://www.spieth-maschinenelemente....ts/series-msr/
Much better than I would have been able to make or get made.

Can't quite see in the photos of the table. It seems that the marks are circular? Did they use a Lumsden grinder? If so then do check the flatness and parallelism they quoted. It is nowhere near as good as surface grinding that I would have thought they would do for a machine table. But it may of course be good enough for what you want....reminds me that my machine could do with a regrind this year.