Pinion angle question

mopowers said

I get what you're saying, but nothing needs to be level. It just makes the math easier. 1 and 6 is the same as 'level' and 5.

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You know that and I do too, but it would be easier for him to LEARN it that way. Or so I thought. He's still not done it that way yet.....and he thinks he has. lol