How to do a S grind.

[skillgannon]

Thanks for being patient with all my questions lately guys. Thus is the first winter I have had time off from work in years. JT is sending me a box of 15n20 and it looks like I'm going to have a few days off so it's time to make hay.
Does anyone know of a good video or build along for S grinds or other complex grinds? I have gotten pretty good at full flat and would like to start some mules in other grinds

 

[timos-]

use a radius platen to get hollow grinds leaving 0.020 " at the edge, then slack belt grind to get a nice broad convexed edge