Convex Grinding jigs / setups (rotary platen, convex platen, etc.)

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I routinely use such a platen or platens for convex grinds on kitchen knives; I have a 2.5 degree, 3 degree and a five degree platen, much like how a rotary platen has different spacing between its wheels. I was taught to use this by a much more expert professional knifemaker who uses it with every kitchen knife he makes. I understand that it seems like the belt would not conform to the hollow, but it does quite well. I am able to get a very controlled and consistent convex grind whereas using a rotary platen requires more experience than I have to get a predictable result. So if a rotary works for you, then by all means use it, but a fixed platen works well too and may be easier to get used to.

Nathan made a couple for me and as usual they are done beautifully and function great. They are certainly cheaper than a rotary platen

+1 for interest in pics/video or design comments -- this is really interesting!