Correct. Bolting the master cylinder firmly to the handlebar should be the very last step in bleeding brakes, in fact 90% of the air will naturally come to the top given a little patience & holding the master cylinder on an angle is the best way to achieve that.
I have a short section of handlebar that I bolt master cylinders to, so I can achieve the required angle.
It usually results in less than a tablespoon of wasted fluid.
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