In the Shaft Alignment Video #1 I wrote about this in the text on Youtube below the video but you have to click the "show more" to see the whole narrative. I am trying to shoot video or stills as unique projects present themselves in my shop. Bear in mind the guys over at CCfan are probably seasoned DIYers unlike the guy that called last week who called to ask what size wrench he needs to buy to loosen up the (4) coupling bolts. Somewhere I need to draw the line when a DIYer needs to call a mechanic.