Although it's not perfect, I used my wheeler bubble levels the one that is totally flat (usually the one that goes on top of the elevation turret) I tried to find the flattest surface around the safety. I have a Boyd's prairie hunter on my axis, and there is just enough area there to lay the bubble level across it. It's not exactly perfect, but it is closer than I could get it before. Then I plum the scope to the plumb line. I don't use the bubble level on top of the turret.
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