Looking for a drawing I did a while ago and came up with this picture.

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Not suitable for your use because you can't get the centres in you need but it was an exercise on keyhole milling to get water passages nearly all the way round the mount to keep the Kress bearings cool.

Not sure if any are left but i don't use my Kress now I have the high speed spindle so I'll do a search and see what I have