How would i weld an object to the player's head? (edited)

I want a brick to welded to a players head 5 studs in front of the player's head. What am i doing wrong?

This is my current script. Nothing happens when i run it.

local w = Instance.new("ManualWeld")
local head = game.Players.LocalPlayer.Character:WaitForChild("Head")
w.Part0 = head
w.Part1 = Instance.new("Part" ,game.Workspace)

w.C0 = CFrame.new(0, 0, 0) * CFrame.new(0, 0, -5 ) * CFrame.fromEulerAnglesXYZ(0,0,0) --first CFrame is part0 second CFrame is part1 third CFrame is rotation

thanks for your help.