Hollowpoint, that is a work of art mate, you have done a great job there! I want to make one now…
Here's something I made a while back:
It's an oil burner made from an old brass weight. I bored for the three columns on a PCD, then bored the dished copper top to the same PCD. It fitted ok after a bit of tweaking.
In the first picture you can see the calibration stamps on the underside, they start at 1943 and the last one is 1951.
Regards,
John.