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Can this precision level be calibrated?

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Hi,
I got this old beat up frame precision level, cleaned it up some and stoned the burs.
I have a surface plate with three adjustable feet, so I leveled it until I got the bubble in the middle, when I turn it 180° it is not showing the same result, it is around 4 lines out.
My question is can this be adjusted, on most of these precision levels there is a way. But on this one the glass tube looks to be glued and permanently set in place with some relatively hard resin/glue. (you can see on...

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