[Rilgamon]

From https://github.com/tomrus88/Blizzard...merAugment.lua I'd guess the callback gets called with the right object to use cancel on. So this should work:

local T = C_Timer.NewTicker(1, function(self)
        if CUSTOMFRAME then
            CUSTOMFRAME:HookScript("OnUpdate", function(self)
                print("have it")
            end)
            self:Cancel()
        end
    end)