Well you are in luck. No video but images of analysis. Hedgehog plot of normal vectors, they converge to flat at stem base. Hard to see since the stem/dimple share space.
Confirmation of immediate angle at stem base
Slope plot. Green being 0 degrees from up vector.
Dimple hole showing its not a cylindrical stem
Stem slope, green being immediate 0 vector
Written letters and phonecalls on the weekend when the long distance rate was cheaper.