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That is exactly why I use the BO Dead level because of issues like what FourT described.
With the Dead Level you don't even need the weapon present. Mount your rings to the rail for correct spacing, mount scope, level, tighten caps and done.
I have that Arisaka tool. But I've never been able to use it because it won't fit under any of my scopes lol. Your scope needs to be mounted like 10 feet off your rail in order to use it. Even with the "small" version (which I have), I can only get just a tiny bit of the tip in (ha!). If you have a typical 5-25x or similar long-range scope mounted in rings... the Arisaka won't work.
A deck of playing cards is what I use now. Takes all of 2 minutes to mount a scope with 'em. Though feeler gauges might be better because playing cards are a bit flexible and can bend when the scope wants to rotate.
Two answers to this:
1) To get the scope parallel to the receiver, use feeler gauges.
2) To get the reticle plumb, get behind the rifle holding it properly while looking through the optic and adjust the position of the reticle to be in line with a plumb line downrange, regardless of if the scope is canted in relation to the receiver.