possible to lock aperture, zoom + focus?

Position preset doesn't do anything unless you engage it, and even then it will only transition from one point to another. Won't lock the focus or zoom. I think you might be able to lock the zoom ring by switching to the handle zoom, but there's no way to lock focus.
 
You can set a custom focus preset and a custom zoom preset... That's what I do with the Letus Ex... But... I have bumped it in the past and not noticed... So you can't actually lock it down...
 
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