I thought it might be useful since there seems to always to be a lot of confusion as to which timing mark to use. Some would say one and others would say the other one. Course if you know everything is correctly timed in the engine and also internal to the mag, you don't need to use either one. But it's best to work step-by-step and follow the book to be sure everything is correct. I can't say I have ever noticed anyone saying you could use either mark, depending on how you do it - therefore the web page. And it's sort of fun to do, as you know from all your helpful photos you post or link to.
One thing I should have done but didn't was show a picture of the drive gear tang recesses when #1 is TDC. If I think of it, the next time I have the mag off I'll add that to the page.