Trouble with this changed function in a localscript?

local lplayer = game.Players.LocalPlayer
local RS = game:GetService("RunService")


playerparts = {lplayer.Character.Head, lplayer.Character.Torso, lplayer.Character.HumanoidRootPart}

RS.Stepped:connect(function()
    repeat wait() until lplayer:FindFirstChild("Torso") and lplayer:FindFirstChild("Head") and lplayer:FindFirstChild("HumanoidRootPart")
    lplayer.Character.Changed:connect(function(Property)
        if Property == "CanCollide" then
            for i,v in pairs(playerparts) do
                v.CanCollide = false
            end
        end
    end)
end)

It doesn't change the head or torso's CanCollide to false, no matter what I try. Any help on this ?