My measurement is to the bottom of the retsiner. Unfortunately there is s very small lip on the outside perimeter of it that hangs down a tiny bit, so as I am unable to get the caliper to the actual surface that the top of the spring contacts.

However I believe that I am very close in judging just how much how much higher this contact point is than this so called hang over lip.

Visualize a pie pan laying upside down. This hang over is not that extreme, but that is an example. I will post a up close photo tomorrow.

Visually coil bind is non existent by a large amount. Same for open valve rocker to top of retainer.