What does checking run out mean? how to check?
Pay close attention. There are a lot of details but it works.
Potential issues are making sure the bearing in the T56 front plate is all the way in, and the indicator/base are mounted firmly. If you can grab it and move it more than a couple/few thousandths with minor effort, gravity will get you.
And knowing which way to put the pins in. This is where I messed up, but the video clearly covers it.





